¶ 1. This is an appeal from a judgment of the Circuit Court for Winnebago County, Robert A. Haase, Circuit Court Judge. The appeal is here on certification from the court of appeals. Wis. Stat. (Rule) § 809.61 (1995-96). 1
¶ 2. The defendant, David M. Hahn, appeals his sentence of life in prison without the possibility of parole under Wisconsin's persistent repeater statute, Wis. Stat. § 939.62(2m) (1997-98), commonly known as Wisconsin's "three strikes" law. The statute provides for mandatory life imprisonment for offenders convicted of committing for a third time a statutorily specified "serious offense." The statute in issue is silent about whether the offender may challenge the validity *892 of a prior conviction at the enhanced sentence proceeding.
¶ 3. Two questions of law are presented in this case. 2 The first is whether the U.S. Constitution requires that an offender be permitted during an enhanced sentence proceeding predicated on a prior conviction to challenge the prior conviction as unconstitutional because the conviction was allegedly based on a guilty plea that was not knowing, intelligent, and voluntary. The circuit court concluded that it had the power to examine the validity of the prior conviction on these grounds but was not required to do so.
¶ 4. We conclude that an offender does not have a federal constitutional right to use the enhanced sentence proceeding predicated on a prior state conviction as the forum in which to challenge the prior conviction, except when the offender alleges that a violation of the constitutional right to a lawyer occurred in the prior state conviction. 3 We further conclude, as a matter of judicial administration, that an offender may not use the enhanced sentence proceeding predicated on a prior conviction as the forum in which to challenge the prior conviction, except when the offender alleges that a violation of the constitutional right to a lawyer occurred in the prior state conviction. Because the defendant in the present case does not allege that a violation of his constitutional right to a lawyer occurred in the prior conviction, he may not challenge *893 his 1994 conviction during this 1997 persistent repeater proceeding.
¶ 5. The second question of law presented is whether the persistent repeater penalty enhancer as applied to the defendant violates the Eighth Amendment to the U.S. Constitution prohibiting cruel and unusual punishment. For the reasons set forth, we reject the defendant's Eighth Amendment challenge to Wisconsin's persistent repeater statute, Wis. Stat. § 939.62(2m).
HH
¶ 6. The relevant facts in this case are undisputed. In 1997, the Winnebago County district attorney charged the defendant under Wis. Stat. § 948.02 with two counts of sexual assault on a child. Because the defendant had two prior felony convictions for sexual assault on a child, he was subject to a life sentence without the possibility of parole under Wis. Stat. § 939.62(2m). Both prior convictions were based on the defendant's guilty pleas, the first in 1990 and the second in 1994. During the 1997 persistent repeater proceeding, the defendant sought to reopen the 1994 conviction on the grounds that his plea was not knowing, intelligent, and voluntary because the circuit court failed to inform him that the conviction could serve as a "strike" offense under the "three strikes" law. During the 1997 proceeding, the circuit court denied the defendant's motion to strike his 1994 conviction, holding that the circuit court's failure to inform the defendant during his 1994 guilty plea that the resulting conviction could later be used to sentence him as a persistent repeater did not render his guilty plea invalid.
*894 ¶ 7. The defendant pled guilty to the 1997 offenses and, on the basis of his prior convictions, was sentenced as a persistent repeater to life in prison without the possibility of parole under Wis. Stat. § 939.62(2m). The defendant appealed, arguing that the circuit court's denial of his motion to strike the 1994 conviction violated his due process rights and that his life sentence violated the Eighth Amendment’s prohibition against cruel and unusual punishment. We address each issue in turn.
¶ 8. The defendant contends that the circuit court erred by failing to strike the 1994 conviction because his guilty plea was not knowing, intelligent, and voluntary and therefore did not satisfy federal constitutional due process requirements. The defendant relies on
State v. Baker,
¶ 9. The State argues that this court should revisit its holding in
Baker
in light of
Custis v. United States,
¶ 10. We therefore examine
State v. Baker,
*895
¶ 11. In
Baker,
the offender used the enhanced sentence proceeding in a conviction for operating after revocation of a license to challenge two prior operating-after-revocation сonvictions that the State sought to apply for sentencing enhancement purposes. The offender challenged one of the convictions because the plea was allegedly not knowing, intelligent, and voluntary.
Baker,
¶ 12. The
Baker
court relied on
Burgett v. Texas,
¶ 13.
Burgett
had considered whether prior convictions rendered without the assistance of сounsel could be used to enhance sentences for subsequent offenses. The
Burgett
court disallowed the use of a prior conviction in an enhanced sentence proceeding predicated on the prior conviction when the prior conviction violated
Gideon v. Wainwright,
¶ 14. In
Baker,
this court was faced with the question of whether to extend the holding of
Burgett
to prior convictions allegedly obtаined in violation of a constitutional right other than the
Gideon
right to a lawyer. The case law was largely unsettled at that time, but a number of jurisdictions had applied the
Burgett
rule to a prior conviction allegedly obtained in violation of a constitutional right other than the right
*896
to a lawyer.
4
The
Baker
court acknowledged, however, that "[s]ome courts have confined the application of
Burgett
to convictions invalid under
Gideon
[v.
Wainwright,
¶ 15. The
Baker
court determined that the decision in
Burgett
rested on the principle that a prior conviction may not be used in an enhanced sentence proceeding predicated on a prior conviction if the prior conviction was allegedly obtained in violation of a constitutional right that would affect the reliability of the prior conviction.
Baker,
¶ 16. After
Baker,
the U.S. Supreme Court clarified the
Burgett
decision in
Custis v. United States,
*898 ¶ 17. The Custis court read the federal constitutional rights of an offender to challenge a prior state conviction in a federal enhanced sentence proceeding more narrowly than did the Wisconsin supreme court in Baker. Accordingly, we conclude that Baker should be limited to adhere to Custis: In an enhanced sentence proceeding predicated on a prior conviction, the U.S. Constitution requires a trial court to consider an offender's allegations that the prior conviction is invalid only when the challenge to the prior conviction is based on the denial of the offender's constitutional right to a lawyer.
¶ 18. Accordingly, we conclude that the defendant in the present case has no federal constitutional right in his 1997 third strike proceeding as a persistent repeater under Wis. Stat. § 939.62(2m) to challenge the use of a prior conviction allegedly based on a guilty plea that was not knowing, intelligent, and voluntary. 7
*899 ¶ 19. The defendant argues that Custis is a forum case based on considerations of federalism and administrative convenience and that we should not alter our Baker decision. 8 The defendant contends that Custis applies only tо an enhanced sentence proceeding in a federal court in which a challenge is made to a prior state conviction. Unlike Custis, the defendant argues, this case involves a challenge to a prior state conviction in a subsequent state enhanced sentence proceeding.
¶ 20. In its final paragraph, the Custis court addressed whether an offender who was barred from challenging a prior state conviction in a federal enhanced sentence proceeding could challenge the predicate state conviction by another means. The U.S. Supreme Court stated:
*900 We recognize. . .that Custis, who was still "in custody" for purposes of his state convictions at the time of his federal sentencing under § 924(e), may attack his state sentences in Maryland or through federal habeas review. . . .If Custis is successful in attacking these state sentences, he may then apply for reopening of any federal sentence enhanced by the state sentences. We express no opinion on the appropriate disposition of such an application. 9
*901
¶ 21. Thus the U.S. Supreme Court expressly left open the possibility that an offender may challenge a prior state conviction in a state court proceeding or in a federal habeas proceeding and then, if successful, apply to reopen his enhanced federal sentence. Custis,
¶ 22. The issue then becomes whether this court should, as a matter of judicial administration rather than as a matter of federal constitutional right, allow an offender to challenge a prior state conviction in an enhanced sentence proceeding on grounds other than an alleged violation of the constitutional right to a lawyer, or whether this court should require an offender to *902 use available procedures other than the enhanced sentence proceeding to challenge a prior conviction.
¶ 23. The
Custis
court presents two justifications based on considerations of judicial administration and federalism to support its constitutional holding that in an enhanced sentence proceeding predicated on a prior conviction the U.S. Constitution requires a trial court to consider an offender's allegations that the prior conviction is invalid only when the challenge to the prior conviction is based on the denial of the offender's constitutional right to a lawyer.
Custis,
¶ 24. First, the
Custis
court states that it would be difficult for federal courts to review a multitude of potential constitutional violations in convictions from 50 different states. While
Burgett
focused on the lack of a lawyer, which the U.S. Supreme Court viewed as readily apparent in the record of a conviction, extending
Burgett
to other constitutional violations such as ineffective assistance of counsel would require federal courts to "rummage through frequently nonexistent or difficult to obtain state-court transcripts or records that may date from another era."
Custis,
¶ 25. Although this justification does have merit in the context of state court proceedings, it may not apply with equal force. It is probably easier for a Wisconsin court to review a conviction entered by аnother Wisconsin court than for a federal court to review a state court conviction. Nevertheless, we conclude that an offender should not be permitted to challenge a prior conviction in an enhanced sentence proceeding predicated on the prior conviction except for an alleged violation of the constitutional right to a lawyer. Administrative difficulties arise when a Wisconsin circuit *903 court reviews a prior conviction entered by another Wisconsin court; the reviewing court does not havе the record of the prior conviction or of post-conviction proceedings. In addition, it seems preferable from an administrative standpoint to require all offenders to use the same procedures to review convictions, irrespective of whether the conviction becomes the basis of an enhanced penalty in a subsequent sentencing procedure.
¶ 26. Second, the
Custis
court justified its holding as promoting finality of judgments. A broad reading of
Burgett,
the U.S. Supreme Court concluded, would "undermine confidence in the integrity of our procedures" by calling intо question the finality of prior convictions and by delaying penalty enhancement proceedings.
Custis,
¶ 27. The
Custis
court concerns about finality and delay,
Custis,
¶ 28. Although these administrative considerations may weigh differently in different cases, we conclude that considerations of judicial administration favor a bright-line rule that applies to all cases. We therefore hold that a circuit court may not determine
*904
the validity of a prior conviction during an enhanced sentence proceeding predicated on the prior conviction unless the offender alleges that a violation of the constitutional right to a lawyеr occurred in the prior conviction. Instead, the offender may use whatever means available under state law to challenge the validity of a prior conviction on other grounds in a forum other than the enhanced sentence proceeding. If successful, the offender may seek to reopen the enhanced sentence.
10
If the offender has no means available under state law to challenge the prior conviction on the merits, because, for example, the courts mever reached the merits of this challenge under
State v. Escalona-Naranjo,
¶ 29. In sum, the primary holding of Custis, to which this court is bound as a matter of federal constitutional law, is that an offender does not have a federal constitutional right to use an enhanced sentence proceeding predicated on a prior conviction as the forum in which to challenge the prior convictiоn except when the offender alleges that a violation of the constitutional right to a lawyer occurred in the prior conviction. An offender may challenge the validity of a prior conviction on other grounds in a forum other than the *905 enhanced sentence proceeding by whatever means available under state law. If the offender succeeds, the offender may seek to reopen a sentence imposed as a persistent repeater under Wis. Stat. § 939.62(2m) if that sentence was based on the vacated convictiоn. Accordingly, we conclude that the defendant in this case does not have a federal constitutional right to use the 1997 enhanced sentence proceeding that was predicated on the 1994 state conviction as the forum in which to challenge the 1994 conviction because the defendant did not assert that a violation of the constitutional right to a lawyer occurred in that prior conviction.
hH I — I hH
¶ 30. We also reject the defendant's Eighth Amendment cruel and unusual punishment challenge to his life sentence under Wis. Stat. § 939.62(2m)(b). A statute is presumed constitutional and will be held unconstitutional only if it appears so beyond a reasonable doubt. The burden of establishing unconstitutionality of a statute is on the party attacking its constitutionality.
State v. Borrell,
¶ 31. The defendant maintains that the gravity of his offense is not proportional to his punishment for several reasons: his sexual assault contact offenses are less serious than sexual intercourse; he is 26 years old so life imprisonment for him amounts to a greater punishment than for an older person; and his sentence is disproportionate to the sentence for a more sеrious crime such as first-degree intentional homicide.
¶ 32. Several decisions of the U.S. Supreme Court and this court compel the conclusion that the *906 application of Wis. Stat. § 939.62(2m) to the defendant does not constitute cruel and unusual punishment.
¶ 33. The first principle of Eighth Amendment jurisprudence established in
Rummel v. Estelle,
¶ 34. The Wisconsin legislature has determined that sexual contact is a "serious felony" and that three or more violations of crimes classified as serious felonies merit lifetimе imprisonment. See Wis. Stat. § 939.62(2m). Forty-seven states and the District of Columbia have enacted persistent repeater statutes, many of which require life sentences upon an offender's third offense. These persistent repeater statutes and the resulting sentences have withstood Eighth Amendment challenges. 11
*907
¶ 35. The defendant asserts that application of Wisconsin's persistent repeater statute to his case imposes punishment grossly disproportionate to the severity of the crime. The U.S. Supreme Court decisions relating to the doctrine of disproportionate sentences in Eighth Amendment jurisprudence are not clear.
12
Nevertheless, the defendant's claim must fail. In
Rummel,
¶ 36. The case law in Wisconsin reflects a similar pattern. In
State v. Lindsey,
¶ 37. On the basis of these cases and the circumstances of this case, we conclude that application of the persistent repeater statute to the defendant does not violate the Eighth Amendment's prohibitiоn against cruel and unusual punishment.
¶ 38. For the reasons set forth we affirm the judgment of the circuit court.
By the Court. — The judgment of the circuit court is affirmed.
Notes
All subsequent references to the Wisconsin Statutes are to the 1995-96 volumes unless otherwise indicated. Section 939.62(2m) was modified by the legislature by 1997 Wis. Act 326.
Both questions of law are determined by this court independently of the circuit court, although we benefit from the analyses of the circuit court.
The Sixth Amendment to the U.S. Constitution guarantees the assistance of counsel. That amendment is made applicable to the states by virtue of the Fourteenth Amendment.
Gideon v. Wainwright,
For examples of jurisdictions that extended
Burgett v. Texas,
For examples of jurisdictions that narrowly construed
Burgett v. Texas,
For other states interpreting
Custis v. United States,
Custis
does not bar states from allowing offenders to challenge prior state convictions in state enhanced sentence proceedings. New York courts, for example, continue to allow offenders charged as persistent repeaters to challenge unconstitutional prior state convictions in the repeater proceeding.
See, e.g., People v. Zeoli,
*898 the applicable provisions of the constitution of the United States must not be counted in determining whether the defendant has been subjected to a predicate felony conviction"). The defendant in the present case asserts no statutory basis for his challenge.
In so holding, this cоurt joins several other jurisdictions that have had to scale back
Burgett v. Texas,
See, e.g., Nichols v. United States,
For discussions of
Custis v. United States,
Custis,
*901
The State has advised this court that the U.S. Supreme Court has granted a petition for a writ of certiorari in
Daniels v. United States,
No. 99-9136, — U.S. — (2000), to review the Ninth Circuit's decision in
United States v. Daniels,
The issue presented in the Daniels case relates to procedures available to an offender in federal court, other than in the enhanced sentence proceeding, to challenge a prior state conviction. The present case relates to an offender's challenges in a state enhanced sentence proceeding to a prior state conviction. We do not consider Daniels so directly related to the present case to require us to withhold our decision pending the decision of the U.S. Supreme Court in Daniels.
We do not address the validity of the 1994 conviction because the defendant's challenge to the 1994 conviction cannot be raised in the enhanced sentence proceeding that is the subject of this appeal. The question of whether the defendant has means available under state law to challenge the 1994 conviction in another proceeding is not before us.
See,
e.g., United States v. Kaluna,
See, e.g.,
Harvard Law Review Association,
Supreme Court: 1990 Term Leading Cases,
105 Harv. L. Rev. 245 (1991) (noting that "[t]he fractured
Harmelin
[v.
Michigan,
