Alfred Minasyan, a native of Armenia, petitions for review of a per curiam order of the Board of Immigration Appeals (“BIA”). The BIA affirmed the decision of the immigration judge (“IJ”), denying Mi-nasyan’s applications for withholding of removal and protection under the Convention Against Torture (“CAT”). The BIA also found that Minasyan had not demonstrated eligibility for derivative citizenship under a now defunct provision of the Immigration and Nationality Act (“INA”), § 321(a)(3), 8 U.S.C. § 1432(a)(3) (1999), repealed by Pub.L. 106-395, Title I, § 103(a), Oct. 30, 2000, 114 Stat. 1632. 1 We conclude that Minasyan is a derivative citizen of the United States pursuant to that provision, and is thus not subject to removal as a felon convicted of an aggravated offense.
I.
Minasyan, now twenty-five years old, first entered the United States with his family when he was eight, as a refugee from Armenia. He obtained lawful permanent resident status when he was ten. In October 1993, when he was fourteen, Mina-syan’s parents separated and his mother assumed sole custody of him. In December 1994, his mother became a United States citizen through naturalization. 2
Shortly after his eighteenth birthday, in October 1997, Minasyan was arrested on charges of first degree burglary and attempted first degree burglary. He pleaded guilty to both crimes and was sentenced to two years in state prison. 3 Because of this conviction, the Immigration and Naturalization Service (“INS”) 4 initiated removal proceedings. During the proceedings, Minasyan raised a claim of derivative citizenship on the basis of his mother’s naturalization. The Immigration Judge denied the claim on April 30, 1999, and on February 26, 2000, Minasyan was removed to Armenia.
On April 19, 1999, just before the IJ ordered Minasyan removed, Minasyan’s mother filed an action for the dissolution of her marriage. In April of 2001, the Los Angeles Superior Court filed an order granting the dissolution, to be effective in *1073 October 2001. The stipulated judgment issued by the court declared that Mina-syan’s parents had separated on October 1, 1993, and that his mother maintained sole legal custody of him from that date on. No one contests the accuracy of the factual findings or legal determinations contained in the court order.
Minasyan reentered the United States on a visitor’s visa around the end of January 2001. In May 2001, the INS issued a notice of intent to reinstate the prior removal order. In response, Minasyan again asserted his citizenship claim, while also contending that he would be persecuted or tortured if he were returned to Armenia. The INS Citizenship Unit reviewed his file and found that although Minasyan “may have been in the legal custody of his mother at the time of her naturalization, no evidence has been provided to show that his parents’ marital separation had been recognized by a court of law.” The agency then scheduled a hearing before- an IJ to adjudicate his persecution and torture claims.
Before the IJ, Minasyan renewed his claim to derivative citizenship. He relied not only on the 2001 dissolution decree entered by the Los Angeles Superior Court, but on a subsequent nunc pro tunc judgment of that court confirming that his parents were legally separated on October 1, 1993. On the basis of the dissolution decree and the nunc pro tunc order, the IJ concluded that “the respondent has made out a prima facie claim to derivative United States citizenship through his United States citizen mother.” She directed Mi-nasyan to file a N-600 form (“Application for Certificate of Citizenship”) and ordered the INS to adjudicate that application. The IJ explained that “if the applicant is not an ‘alien’ the court lacks jurisdiction to proceed and conduct a withholding only hearing.” On March 12, the District Director denied Minasyan’s citizenship application and informed Minasyan of his right to appeal. 5
The IJ proceeded with the hearing, but declined to consider Minasyan’s claim to citizenship. She explained that because the Citizenship Unit had denied his application, “any judicial interference or decision would have to come from the federal courts and not from the Immigration Court because we do not have authority to declare the respondent a citizen of the United States.” The IJ ruled against Mi-nasyan on the merits of his withholding and CAT claims. 6
*1074 On appeal, the BIA affirmed, concluding that Minasyan had not demonstrated “that he derived United States citizenship under former section 321(a)(3) of the Act.” 7 It also upheld the IJ’s decision that Minasyan was ineligible for withholding of removal and protection under CAT. Minasyan seeks review only of the determination that he is not a United States citizen.
II.
We do not have jurisdiction to review a criminal alien’s final order of removal. 8 U.S.C. § 1252(a)(2)(C). However, where, as here, a petitioner claims that he is a United States citizen and that he is therefore not subject to removal, we have jurisdiction to determine his nationality claim. 8 U.S.C. § 1252(b)(5)(A);
see also Barthelemy v. Ashcroft,
Minasyan argues that he is a derivative citizen pursuant to § 321(a) of the INA because his parents were legally separated and he was in the sole custody of his mother and under the age of eighteen when she was naturalized. In response, the government contends that this court does not have jurisdiction to consider Mi-nasyan’s citizenship claim because he failed to exhaust all available administrative remedies; specifically, he failed to appeal the decision of the District Director to the Administrative Appeals Unit. In the alternative, the government argues that Minasyan is not a derivative citizen by virtue of his mother’s naturalization because he has not established that his parents were legally separated before his eighteenth birthday. We reject both of these arguments and conclude that Mina-syan meets the requirements of citizenship as set forth in former § 321(a).
1. Exhaustion
For a court to review a final order of removal an alien must typically exhaust all administrative remedies available to the alien as of right. 8 U.S.C. § 1252(d)(1);
see Barron v. Ashcroft,
The executive may deport certain aliens but has no authority to deport citizens. An assertion of U.S. “citizenship is thus a denial of an essential jurisdiction fact” in a deportation proceeding. Ng Fung Ho v. White,259 U.S. 276 , 284,42 S.Ct. 492 ,66 L.Ed. 938 (1922); see also Frank v. Rogers,253 F.2d 889 , 890 (D.C.Cir.1958) (“Until the claim of citizenship is resolved, the propriety of the entire proceeding is in doubt.”).
Id.
at 1136. As in
Rivera,
if the government’s argument that exhaustion is required were correct, “it would be possible to unintentionally relinquish U.S. citizenship .... The Constitution does not permit American citizenship to be so easily shed.”
Id.
Thus, “[t]he statutory administrative exhaustion requirement of § 1252(d)(1) does not apply” to “a person with a non-frivolous claim to U.S. citizenship” even if he has previously been (illegally) deported by the government.
Id.
at 1140.
See also Moussa v. INS,
2. Derivative Citizenship
Citizenship for one not born in the United States may be acquired “only as provided by Acts of Congress.”
Miller v. Albright,
INA § 321(a), provides, in pertinent part, that:
A child born outside of the United States of alien parents ... becomes a citizen of the United States upon fulfillment of the following conditions:
(3) The naturalization of the parent having legal custody of the child when there has been a legal separation of the parents ...; and if
(4) Such naturalization takes place while such child is under the age of eighteen years; and
*1076 (5) Such child is residing in the United States pursuant to a lawful admission for permanent residence at the time of the naturalization of ... the parent naturalized under clause (2) or (3) of this subsection, or there-after begins to reside permanently in the United States while under the age of eighteen years.
8 U.S.C. § 1432(a) (repealed 2000). 11 Mi-nasyan meets condition (4), as his mother was naturalized in 1994, when he was 15 years old. He also meets condition (5) because he began to reside in the United States in 1988, when he was eight. With respect to condition (3), the government concedes that, because Minasyan was in the actual custody of his mother when she was naturalized, the legal custody condition would be met if he could show that his parents were legally separated at that time. 12 The critical question, therefore, is whether, at the time of his mother’s naturalization, “there ha[d] been a legal separation of the parents.” INA § 321(a)(3).
The meaning of the term “legal separation” as contained in former INA § 321(a)(3) is a question of federal statutory interpretation.
See Brissett v. Ashcroft,
The Supreme Court has long held that while the “scope of a federal right is, of course, a federal question, ... that does not mean that its content is not to be determined by state, rather than federal law.”
De Sylva v. Ballentine,
Here, we conclude that the term in question&-“legal separation”-means a separation recognized by law; because there is no federal law of domestic relations, that necessarily means a separation recognized by state law. As the Supreme Court recently emphasized, “ ‘[t]he whole subject of the domestic relations of husband and wife, parent and child, belongs to
*1077
the laws of the States and not to the laws of the United States.’ ”
Elk Grove Unified Sch. Dist. v. Newdow,
Thus, we must look to the law of California — the state with jurisdiction over Mina-syan’s parents’ marriage — when deciding whether a legal separation occurred.
See Wedderburn,
Our decision to look to state law is consistent with our practice in other areas of federal law generally, and immigration law specifically. For example, entitlement to federal social security benefits often hinges on marital status as defined by state law.
See Califano v. Jobst,
*1078
We now turn to California law. The California Family Code provides for both “legal separation” and “dissolution of marriage.”
See
Cal. Fam.Code §§ 2320-21, 2330, 2338 (2004). In addition, California case law recognizes that spouses are separated for legal purposes beginning on a court defined “date of separation.” Such a separation is a separation by virtue of law.
See In re Marriage of Norviel,
We must consider which of these three forms of separation under California law constitute a legal separation for purposes of § 321(a). First, although the INA uses the term “legal separation” and does not mention “divorce” or “dissolution,” we think it clear that Congress did not intend to exclude orders of divorce or dissolution from coverage under the statute. Second, because the term “legal separation” cannot possibly be limited to orders expressly so titled, we conclude that it encompasses other forms of court-ordered recognition of the final breakup of a marriage. When the term “legal separation” was adopted by Congress as part of the derivative citizenship provision, first in 1940 and then again in 1952,
15
it clearly referred to a separation by virtue of law, rather than the narrower statutory procedure titled “legal separation.” Indeed, the narrower “legal separation” provision that currently appears in the California Code did not exist at the time of the Congressional actions. Rather, California law provided for dissolution of marriage and annulment,
see, e.g.,
Cal. Civ.Code §§ 82-86, 90-92 (1939); Cal. Civ.Code §§ 82-84, 90-92 (1951), and it recognized spouses to be separated in a “legal sense” when they were “living separate and apart” and there had been a “final rupture of the marital relationship.”
Makeig,
Central to our determination is the fact that in California a separation by virtue of law entails important legal consequences under state law. Specifically, it “dictates the character of property acquired thereafter.”
Norviel,
In this case, the California Superi- or Court entered a formal order — the judgment of dissolution of marriage — that recognized that Minasyan’s parents separated in October 1993.
18
Cf. Brissett,
Our recognition of Minasyan’s citizenship status is consistent with several of the identified purposes of ■ former INA § 321(a). In enacting this particular derivative citizenship provision; Congress sought to protect parental rights, to preserve the family unit, and to ensure that only those alien children whose “real interests” were located in • the United States with their custodial parent, and 'not abroad, should be automatically naturalized.
See
S.Rep. No. 2150, at 4 (1940); 86 Cong. Rec. 11945-53 (1940); H.R.Rep. No. 82-1365 pt. B., U.S.Code Cong.
&
Admin.News 1653, 1680 (1952);
Barthelemy,
In this case, there is no danger that one parent’s desire that the child attain derivative citizenship would overcome the objections of another parent with comparable legal rights.
Cf. Barthelemy,
III.
In sum, Minasyan meets the statutory requirements of § 321(a), because his parents were legally separated when his custodial parent naturalized. He may not be a model citizen, but “citizenship is not a license that expires upon misbehavior.”
Rivera,
PETITION GRANTED.
Notes
.Under former INA § 321(a), 8 U.S.C. § 1432, a child born outside of the United States of alien parents automatically becomes a citizen of the United States upon fulfillment of the following conditions:
(1) The naturalization of both parents; or
(2) The naturalization of the surviving parent if one of the parents is deceased; or
(3) The naturalization of the parent having legal custody of the child when there has been a legal separation of the parents or the naturalization of the mother if the child was born out of wedlock and the paternity of the child has not been established by legitimation; and if
(4) Such naturalization takes place while such child is unmarried and under the age of eighteen years; and
(5) Such child is residing in the United States pursuant to a lawful admission for permanent residence at the time of the naturalization of the parent last naturalized under clause (1) of this subsection, or the parent naturalized under clause (2) or (3) of this subsection, or thereafter begins to reside permanently in the United States while under the age of eighteen years.
. Minasyan's father became a citizen through naturalization on June 10, 1999, after Mina-syan had turned eighteen.
. He did not use any weapons or other dangerous items during the commission of the burglary and, consequently, received the minimum sentence.
. The INS ceased to exist on March 1, 2003, when its functions were transferred to the Department of Homeland Security. See Homeland Security Act of 2002, Pub.L. No. 107-296, 116 Stat. 2135. However, we refer to the agency as the INS here because the proceedings in this case were initiated before the transfer.
. The District Director emphasized the issue of custody, explaining that "[t]he Service does not acknowledge nunc pro tunc nor any other type of retroactive agreements to establish legal, physical[] custody for the purpose of obtaining an Immigration benefit. To derive your mother’s American citizenship, there must have been a court order prior to your eighteenth birthday awarding your care and custody to your mother.” Notably, on appeal, the government concedes that, if Minasyan's parents were legally separated, then he was in the legal custody of his mother.
. At the hearing, Minasyan testified as follows: Upon arriving in Armenia, he was interrogated and beaten by six police officers because he was of Iranian descent, and spoke accented Armenian. They hit him in the back of the head, made him strip to his underwear, and robbed him of all his money. Then, while he was dazed and nearly naked, an officer attacked him with a knife, slashing open his hand when he tried to protect himself. After his release, Minasyan, without money or a place to stay, drifted through Yerevan, the capital of Armenia, for several months, picking up odd jobs, using the public baths, and sleeping on park benches. One day, two of the police officers who interrogated him found him sleeping in a park; they handcuffed him, took him to an underground garage and beat him, fracturing his ribs and burning his hands with cigarettes. After he was released, he sought medical attention and then contacted his mother in the States in an attempt to return home. Upon inspection at the hearing, the IJ noted the marks on his *1074 hand but concluded that she could not identify them as cigarette bums.
The IJ found that the crime for which Mina-syan was deported was "a particularly serious crime,” making him ineligible for withholding of removal under either INA § 241(b)(3) or CAT. In the alternative, she found that even if his crime were not "particularly serious,” he failed to establish a clear probability of persecution on account of a protected ground and that his experiences did not constitute torture. Although she indicated that she had some doubts about Minasyan’s testimony, she did not make an adverse credibility determination, finding instead that "even if he is telling us the truth” he had not established eligibility for relief.
. Thus, although the BIA noted that the IJ did not have jurisdiction to reconsider the INS's denial of Minasyan’s citizenship claim, it considered and decided the merits of his claim.
. Because there is no genuine issue of material fact pertaining to Minasyan's nationality claim, we do not transfer the case to the district court but rather maintain jurisdiction to decide the legal issue.
See
8 U.S.C. § 1252(b)(5)(A)-(B);
see also Perdomo-Padilla,
. In
Taniguchi v. Schultz,
. Because citizenship is transmitted automatically upon the parent’s naturalization, it does not depend on the filing of an application, an administrative decision, a court order, an oath of allegiance, or any other procedure. Immigration Law at § 98.03[5] (citing INS Interp. § 320.1(a)(1)).
. The Child Citizenship Act of 2000 ("CCA"), P.L. 106-395, repealed INA § 321 and amended INA § 320, 8 U.S.C. § 1431. Under this new provision, a child becomes a citizen if a custodial parent naturalizes, even if there has been no legal separation between the parents. However, this court has held that "the CCA granted automatic citizenship only to those children who were under the age of 18, and who met the other criteria, on February 27,2001.”
Hughes,
. In its brief, the government concedes that Minasyan’s mother had actual custody over him and explains that, under agency policy, "[i]n the absence of a judicial determination or judicial statutory grant of custody where the parents are legally separated, the parent having actual uncontested custody is to be regarded as having ‘legal custody’ of the person concerned.”
See also Matter of M,
3 I. & N. Dec. 850,
. This circuit has previously declined to incorporate state law into the INA when construing the term "family ties” in an unrelated provision of the INA. In that instance, however, the term was a broad, general one for which state law provided no express definition.
See Kahn,
. Although we look presumptively to state law to determine whether a legal separation has occurred, "[t]his does not mean that a State would be entitled to use the [term at issue] in a way entirely strange to those familiar with its ordinary usage.”
De Sylva,
. Nationality Act of 1940, Pub.L. No. 76-853, ch. 876, § 314, 54 Stat. 1137, 1145-46 (1940) (codified at former 8 U.S.C. § 714); Immigration and Nationality Act, Pub.L. 82-414, Title III, ch.2 § 321, 66 Stat. 245 (1952) (codified at former 8 U.S.C. § 1431).
. We note that there have been significant changes to California’s family law in the last fifty years, most notably the amendment of provisions that discriminated on the basis of gender. By contrast, the form of legal separation that occurs under California law when spouses "have come to a parting of the ways with no present intention of resuming marital relations,' ”
Marsden,
. Notably, under the California Code the "earnings and accumulations of ... the minor children living with, or in the custody of, the spouse,” are also the separate property of the custodial spouse after the date of separation. Cal. Fam.Code § 771(a). " ‘Property’ includes real and personal property and any interest therein.” Cal. Fam.Code § 113.
. The subsequent nunc pro tunc order reiterates the original judicial determination that Minasyan’s parents separated, as a matter of law, in October 1993. It clarifies that the separation constituted a legal separation under California law. It. does not, however, change in any way the parties’ prior status. In their arguments, the parties both emphasize the nunc pro tunc order. However, we need not consider whether to give any effect to that order because the judgment entered during the divorce proceedings resolves the legal question definitively.
.We note that at least one circuit has concluded that a separation must be formally or judicially recognized for it to constitute a legal separation within the meaning of the INA. As the Second Circuit reasoned, "[a] contrary interpretation would render superfluous the provision's specification that the separation must be 'legal.' ”
Brissett,
. This case is unlike those in which petitioners have sought to change relationships retroactively.
See Fierro v. Reno,
