OPINION OF THE COURT
The relevance of past convictions to sentences for current crimes has been one of the most frequently litigated issues under the regime of the federal sentencing guidelines. One vein in this seemingly limitless mine of jurisprudence is whether and when a federal defendant can bring a collateral attack challenging the constitutional validity of past convictions during his federal sentencing proceedings. The Supreme Court and this court have rejected such collateral attacks in
Custis v. United States,
This appeal, which arises out of a cocaine distribution case in which the defendant pled guilty to violating 21 U.S.C. §§ 841(a)(1) and 841(b)(1)(C), extracts more ore from the Custis and Thomas vein. It presents the narrow question whether a defendant, during sentencing, can lodge a collateral attack based on an alleged denial of his sixth-amendment right to a jury trial, thereby challenging the constitutionality of an underlying state-court conviction used to calculate his United States Sentencing Guidelines Criminal History Category under U.S.S.G. § 4A1.1. Because neither 21 U.S.C. § 841 nor U.S.S.G. § 4A1 explicitly provides defendants the right to make a collateral challenge during federal sentencing proceedings, and because the defendant’s constitutional challenge is not based on an alleged Gideon violation, we hold that the District Court properly refused to entertain the defendant’s collateral attack. We will therefore affirm the judgment of the District Court.
I.
On June 29, 1999, Cesar Escóbales pled guilty to distributing 112.4 grams of cocaine in violation of 21 U.S.C. §§ 841(a)(1) and 841(b)(1)(C). The United States Probation Office for the District of Delaware *261 prepared a pre-sentence investigation report (“the PSI”), which was revised to reflect objections made by Escobales’s counsel. The Probation Office calculated Escobales’s base offense level at 18, but reduced the overall offense level to 15 because of acceptance of responsibility. The Probation Office determined that Es-cóbales had 4 criminal history points, pursuant to U.S.S.G. § 4A1.1-2 points based on two prior state convictions and 2 points because he committed the instant offense while on probation. According to the table at Chapter 5, Part A of the U.S.S.G., a defendant with 4 criminal history points is in criminal history category III. The sentencing range for a defendant with a criminal history of category III and an offense level of 15 is 24 to 30 months.
Escóbales objected to the PSI’s inclusion of one of his state convictions. He submitted that one of the' two convictions — a third-degree assault charge — was obtained in violation of his constitutional right to trial by jury, because he pled guilty to the crime without first being made aware of his right to a jury trial by the state judge receiving his uncounselled plea. 1 Had this assault conviction not been included in Escobales’s criminal history calculation, he would have had 3 criminal history points, his criminal history category would have been II, and his sentencing range would have been 21 to 27 months.
The revised PSI accounted for Esco-bales’s objection, and the Probation Office recommended rejecting it in light of this court’s decision in
United States v. Thomas,
At Escobales’s sentencing hearing, the Government argued that neither of Thomas’s, two preconditions for collaterally attacking un underlying state convictioduring a federal sentencing hearing was present in Escobales’s case. The Government also argued that, although Escóbales was being punished pursuant to a different statute and guideline from the defendant in Thomas, the statutes and guidelines in the two cases were functional equivalents. 2 The Government therefore contended that, based on Thomas, it was appropriate for the District Court to con *262 sider the challenged conviction in sentencing Escóbales, and that Escobales’s constitutional challenge was being lodged at the wrong stage of the proceedings and in the wrong forum.
The District Court adopted this reasoning and sentenced Escóbales to 24 months in prison. The Court also imposed a fíne and ordered that Escóbales comply with certain post-release conditions. This appeal followed. The District Court had jurisdiction pursuant to 18 U.S.C. § 3231. This court’s jurisdiction is founded in 28 U.S.C. § 1291 and 18 U.S.C. § 3742(a)(2).
II.
A.
Escóbales makes two arguments on appeal. First, he contends that his being denied his right to a jury trial is on a par with being denied the right to counsel, and therefore, that he should be able to attack collaterally his state conviction during his federal sentencing proceedings. In Custis, the Supreme Court rejected this type of argument:
Custis invites us to extend the right to attack collaterally prior convictions used for sentence enhancement beyond the right to have appointed counsel established in Gideon [v. Wainwright,372 U.S. 335 ,83 S.Ct. 792 ,9 L.Ed.2d 799 (1963) ]. We decline to do so. We think that [the] ... failure to appoint counsel for an indigent defendant [is] a unique constitutional defect. Custis attacks his previous convictions claiming the denial of the effective assistance of counsel, that his guilty plea was not knowing and intelligent, and that he had not been adequately advised of his rights in opting for a “stipulated facts” trial. None of these alleged constitutional violations rises to the level of a jurisdictional defect resulting from the failure to appoint counsel at all.
Thomas
read
Custis
to mean that only
Gideon
violations could be attacked collaterally during federal sentencing proceedings.
See Thomas,
Moreover, the right-to-jury-trial claim brought here by Escóbales is analogous to the uninformed-guilty-plea claims rejected in both Custis and Thomas. In all three cases, the gravamen of the defendant’s constitutional challenge was that his guilty plea was not knowing and intelligent because he was not informed of certain rights he would be waiving by entering his plea. Because Custis and Thomas declined to reach such claims when brought collaterally during sentencing, so must we.
B.
Escobales’s second argument is that the statute under which he was sentenced explicitly provided him with the right to attack collaterally, at sentencing, the constitutionality of his underlying convictions. This argument is unavailing, however, because in advancing it Escóbales is forced to rest his contention on a statute under which he was neither charged nor sentenced — 21 U.S.C. § 851.
Escóbales was charged with and pled guilty to violating 21 U.S.C. §§ 841(a)(1) and 841(b)(1)(C). Had the government wished to pursue statutory enhancements for prior convictions, it could have moved under 21 U.S.C. § 851 to seek such statutory enhancements to the maximum sentence provided for under § 841(b)(1)(C). It did not do so. Instead, it relied on the criminal history category portion of the Guidelines, U.S.S.G. § 4A1.1, to account for Escobales’s past misdeeds. Neither 21 U.S.C. § 841 nor U.S.S.G. § 4A1, in any of its subsections or commentary, explicitly
*263
provide the defendant with the right to attack his prior convictions collaterally during sentencing proceedings.
See
21 U.S.C. § 841; U.S.S.G. § 4A1;
Thomas,
Sentences resulting from convictions that (A) have been reversed or vacated because of errors of- law or because of subsequently discovered evidence exonerating the defendant, or (B) have been ruled constitutionally invalid in a prior case are not to be counted. With respect to the current sentencing proceeding, this guideline and commentary do not confer upon the defendant any right to attack collaterally a prior conviction or sentence beyond any such rights otherwise recognized in law....
U.S.S.G. § 4A1.2 cmt. 6 (1998) (emphasis added). Therefore, pursuant to Custis and Thomas, Escóbales did not have the statutory right to attack his state conviction when the District Court was sentencing him.
Escóbales nonetheless argues that 21 U.S.C. § 851 explicitly provides for such a right. In fact, § 851(c) does so, as is detailed in the margin, and as was noted in
Custis,
Therefore, the judgment of the District Court will be affirmed.
Notes
. Because we ultimately decide that we cannot reach the merits of this argument, we do not describe the legal precepts involved or the surrounding facts in detail. We do note, however, that the gravamen of Escobales’s complaint is that the state family court judge who received his plea did not inform him that if he refused to plead guilty to the assault charge, he could appeal any conviction arising out of a bench trial before the family court to the superior court, where he would be entitled to a de novo trial before a jury.
.
Thomas
involved a defendant who pled guilty to bank robbery, 18 U.S.C. § 2113(a), and whose offense level and criminal history category were increased, pursuant to U.S.S.G. § 4B1.1, because of his career offender status.
See
. Section 851(c) provides, in pertinent part:
(1) If the person denies any allegation of the information of prior conviction, or claims that any conviction alleged is invalid, he shall file a written response to the information.... The court shall hold a hearing to determine any issues raised by the response which would except the person from increased punishment....
(2) A person claiming that a conviction alleged in the information was obtained in violation of the Constitution of the United States shall set forth his claim, and the factual basis therefor, with particularity in his response to the information. The person shall have the burden of proof by a preponderance of the evidence on any issue of fact raised by the response....
21 U.S.C. § 851(c).
