OPINION

Ronnie Peppers argues on appeal that the criminal statute to which he unconditionally pled guilty in the District Court is unconstitutional. For the reasons set forth below, we will affirm.

I.

Because we write solely for the benefit of the parties, we recount the facts and the *407 procedural history of this case only as they are relevant to the following discussion.

In November 2000, the federal government charged Peppers with, among other things, committing first-degree murder. Just before jury selection was to begin, Peppers announced that he wished to represent himself but the District Court Judge denied his request. A jury subsequently convicted Peppers and the District Court Judge sentenced him to life in prison plus five years. On appeal a three-judge panel of our Court vacated Peppers’s conviction and remanded for a new trial because it determined that the District Court Judge had not properly ruled on Peppers’s request to represent himself at trial. See United States v. Peppers, 302 F.3d 120 (3d Cir. 2002).

On remand, Peppers entered into a plea agreement with the United States Attorney for the Middle District of Pennsylvania. In exchange for the United States Attorney’s promise to drop all of the other charges and to seek only an agreed-upon fifteen-year sentence, Peppers agreed to plead guilty to possessing a .22 caliber revolver as an armed career criminal in violation of 18 U.S.C. § 922(g)(1) (the “felon-in-possession” statute). Following a hearing, the District Court Judge accepted Peppers’s guilty plea and sentenced him to fifteen years in prison. The sentence also included five years of supervised release, a $1,200 fine, and a $100 special assessment. At the hearing, Peppers specifically acknowledged, through his attorney, that the revolver in question had traveled in interstate commerce.

Immediately following his sentencing, Peppers filed a notice of appeal. He argues on appeal that his conviction must be vacated because the felon-in-possession statute is unconstitutional insofar that it exceeds the powers granted to Congress under the Commerce Clause.

II.

We have jurisdiction to hear this appeal pursuant to 28 U.S.C. § 1291. Our standard of review is “plain error” because Peppers acknowledges that he did not raise the Commerce Clause argument before the District Court. See United States v. Gricco, 277 F.3d 339, 350 (3d Cir. 2002). Under plain error review, we may grant relief only if the District Court committed an error, it was plain, and it affected substantial rights of the defendant. United States v. Olano, 507 U.S. 725, 732, 113 S.Ct. 1770, 123 L.Ed.2d 508 (1993).

III.

Peppers’s argument is fairly simple. He contends that the felon-in-possession statute, 1 which makes it illegal for any person who has been convicted of a crime punishable by at least one year in prison to possess “in or affecting commerce” any firearm, is unconstitutional because it does not require the government to prove that the firearm had a “substantial effect” on interstate commerce. While Peppers concedes in his appellate brief that our Court rejected this very argument in United States v. Singletary, 268 F.3d 196 (3d Cir. 2001), which is binding precedent, Peppers explains that the United States Supreme Court has not yet addressed this issue and he therefore raises it before our Court simply to preserve it for review by the Supreme Court.

We could easily affirm Peppers’s conviction under Singletary (thereby clearing the way for Peppers to petition the Supreme Court for review), but the government asks us to take a different tack. The government contends that Peppers waived *408 his right to challenge the constitutionality of the felon-in-possession statute by voluntarily entering a guilty plea in the District Court. See Woodward v. United States, 426 F.2d 959, 964 (3d Cir. 1970) (“A[n unconditional] plea of guilty waives all non-jurisdictional defenses.... ”); Abram v. United States, 398 F.2d 350, 350 (3d Cir. 1968) (same). The government therefore asks us to either dismiss Peppers’s appeal or summarily affirm his conviction without reaching the merits of his argument. In response to the government’s request, Peppers does not dispute that an unconditional guilty plea waives all non-jurisdictional defects. He contends, however, that “[t]he preclusive effects of guilty pleas do not apply ... to constitutional claims that go ‘to the very power of the state to bring the defendant into court to answer the charge brought against him.’ ” (Reply Br. at 1) (quoting Blackledge v. Perry, 417 U.S. 21, 30, 94 S.Ct. 2098, 40 L.Ed.2d 628 (1974)). We disagree.

While Peppers’s claim raises an issue of legislative jurisdiction, see United States v. Ryan, 41 F.3d 361, 363-64 (8th Cir. 1994) (describing Commere Clause claim as “a question of legislative jurisdiction”), that did not affect the District Court’s jurisdiction to accept his guilty plea. One of our sister circuits recently considered this distinction also in the context of an appeal from an unconditional guilty plea, albeit interpreting a different statute, and gave the following explanation:

Martin’s argument rests on the concept that a guilty plea does not waive jurisdictional defenses to the crime at issue. United States v. Nash, 29 F.3d 1195, 1201 (7th Cir. 1994). But the nexus with interstate commerce, which courts frequently call the “jurisdictional element,” is simply one of the essential elements of § 844(i). Although courts frequently call it the “jurisdictional element” of the statute, it is “jurisdictional” only in the shorthand sense that without that nexus, there can be no federal crime under the bombing statute. Kanar v. United States, 118 F.3d 527, 530 (7th Cir. 1997). It is not jurisdictional in the sense that it affects a court’s subject matter jurisdiction, i.e., a court’s constitutional or statutory power to adjudicate a case, here authorized by 18 U.S.C. § 3231. See Steel Co. v. Citizens for a Better Env’t, 523 U.S. 83, 89, 118 S.Ct. 1003, 1010, 140 L.Ed.2d 210 (1998). This court has recognized for decades that, despite defendants’ tendency to “confuse[] facts essential to be alleged as elements of the crime with jurisdictional requirements arising as a matter of law,” once a defendant pleads guilty in “[a] court which has jurisdiction of the subject matter and of the defendant, as did the court in the instant case,” the court’s judgment cannot be assailed on grounds that the government has not met its burden of proving “so-called jurisdictional facts.” United States v. Hoyland, 264 F.2d 346, 352-53 (7th Cir. 1959); La Fever v. United States, 279 F.2d 833, 834 (7th Cir. 1960). Even if the government fails to establish the connection to interstate commerce, the district court is not deprived of jurisdiction to hear the case. See generally Steel Co., 118 S.Ct. at 1010-13.

United States v. Martin, 147 F.3d 529, 531-32 (7th Cir. 1998) (emphasis added).

The same holds true here. Even assuming that the jurisdictional element was missing (an assumption we explicitly rejected in Singletary), the District Court still had subject matter jurisdiction to accept Peppers’s guilty plea. 1 Because Pep *409 pers does not contend that his guilty plea was involuntary, he is foreclosed from raising his Commerce Clause claim on appeal.

For the foregoing reasons, the judgment of the District Court will be AFFIRMED.