ON REMAND FROM THE SUPREME COURT OF THE UNITED STATES

This court affirmed Norman Alan McDonnell’s sentence for his guilty-plea conviction of one count of possession of a *679 firearm by a convicted felon. See United, States v. McDonnell, 88 Fed.Appx. 701 (5th Cir. 2004). The Supreme Court granted McDonnell’s petition for a writ of certiorari, vacated our previous judgment, and remanded the case for further consideration in light of United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005). See McDonnell v. United States, — U.S. —, 125 S.Ct. 1111, 160 L.Ed.2d 990 (2005). This court has received supplemental briefs addressing Booker’s impact.

McDonnell contends that he is entitled to resentencing because the district court erred under Booker by enhancing his sentence based on judicially-determined facts, in violation of the Sixth Amendment, and by sentencing him under a mandatory application of the United States Sentencing Guidelines. This court will not consider a Booker-related challenge raised for the first time in a petition for certiorari absent extraordinary circumstances. See United States v. Taylor, 409 F.3d 675, 676 (5th Cir. 2005).

To the extent that McDonnell argues that the remedial holding of Booker, which rendered the Sentencing Guidelines effectively advisory, should not be applied in his case, his contention runs directly counter to Booker’s determination that both the Sixth Amendment holding and the remedial holding must be applied to all cases on direct review, and is therefore foreclosed. See Booker, 125 S.Ct. at 769. McDonnell seeks to preserve for further review contentions that Booker errors are structural, presumptively prejudicial, and reversible per se. We reject these claims because they conflict with the applicable standard of review for Booker errors, as set forth in United States v. Mares, 402 F.3d 511, 520-21 (5th Cir. 2005), cert. denied, — U.S. —, 126 S.Ct. 43, — L.Ed.2d — (2005). See United States v. Malveaux, 411 F.3d 558, 561 n. 9 (5th Cir. 2005), cert. denied, — U.S. —, 126 S.Ct. 194, — L.Ed.2d — (2005).

McDonnell contends that he can show plain error resulting from the district court’s Sixth Amendment violation because the evidence allegedly supporting the application of sentence enhancements was vigorously contested and was not sufficient to establish the facts necessary to enhance his sentence beyond a reasonable doubt. However, under Mares, in order to establish that Sixth Amendment error affected his substantial rights, as required under the plain error standard, McDonnell must demonstrate “that the sentencing judge-sentencing under an advisory scheme rather than a mandatory one-would have reached a significantly different result.” Mares, 402 F.3d at 520 n. 9. Here, there is no showing of plain error because McDonnell identifies “no evidence in the record suggesting that the district court would have imposed a lesser sentence under an advisory guidelines system.” Taylor, 409 F.3d at 677. Given that plain error has not been shown, “it is obvious that the much more demanding standard for extraordinary circumstances, warranting review of an issue raised for the first time in a petition for certiorari, cannot be satisfied.” Id.

Because nothing in the Supreme Court’s Booker decision requires us to change our prior affirmance in this case, we reinstate our judgment affirming McDonnell’s sentence.

AFFIRMED.