OPINION OF THE COURT

Roberto Santos-Estrella pleaded guilty to being an alien who unlawfully reentered the United States after deportation in violation of 8 U.S.C. § 1326(a) and (b)(2). He was sentenced to forty-one months of imprisonment, followed by three years of supervised release. This appeal does not challenge his conviction. Rather, SantosEstrella contends, for the first time, that the District Court erred in calculating his offense level under United States Sentencing Guideline (“U.S.S.G.”) § 2L1.2(b)(1)(A)(i) by applying the 16 level enhancement for prior “drug trafficking” *456 offenses. Application of this enhancement, according to Santos-Estrella, was precluded under the formal categorical approach embraced in Taylor v. United States, 495 U.S. 575, 110 S.Ct. 2143, 109 L.Ed.2d 607 (1990), because the New York statute under which he had been previously convicted required proof of possession only. Santos-Estrella also asserts that the District Court erred in refusing to depart downward because it believed it lacked the authority to do so. Relying on Blakely v. Washington, 542 U.S. 296, 124 S.Ct. 2531, 159 L.Ed.2d 403 (2004), Santos-Estrella argues that the District Court’s findings at sentencing violated his Fifth and Sixth Amendment rights.

On March 9, 2005, the United States Supreme Court issued its decision in United States v. Booker, —U.S.-, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), holding that the federal sentencing guidelines were not mandatory, but advisory only. Id. at 757. In the wake of the Supreme Court’s decision, this Court requested that the parties address Booker’s applicability. Although Santos-Estrella asserted that Booker applied, he maintained that the sentencing issues he raised should be resolved.

Thereafter, in United States v. Davis, 407 F.3d 162 (3d Cir. 2005) (en banc), this Court explained that in direct appeals of sentences imposed before Booker, where the District Court erroneously treated the Guidelines as mandatory rather than advisory and where we are unable to “ascertain whether the District Court would have imposed a greater or lesser sentence under an advisory framework,” prejudice in a plain error analysis “can be presumed.” Id. at 164-65. We declared that a “[failure to remand for resentencing ... could adversely affect the fairness and integrity of the proceedings. Accordingly, defendants sentenced under the previously mandatory regime whose sentences are being challenged on direct appeal may be able to demonstrate plain error and prejudice.” Id. at 165. Thus, we concluded that in such cases a remand for resentencing is warranted so the District Court may consider the appropriate sentence in the first instance. Id. at 166.

In light of our holding in Davis, we asked counsel for Santos-Estrella during oral argument whether, if we remanded for resentencing under Booker, we were required to reach the issues he raised on appeal. We also noted that Santos-Estrella had not raised his challenge to the sentencing enhancement under U.S.S.G. § 2L1.2(b)(1)(A)(i) when he was before the District Court and that there existed the possibility that the District Court might agree with his position on remand. Counsel conceded that our consideration of the appropriateness of this sentencing enhancement was not “a strict necessity.” We agree. Consistent with Davis, 407 F.3d at 166, we conclude that the sentencing issues raised by Santos-Estrella, including the applicability of both the enhancement in § 2L1.2(b)(1)(A)(i) and Taylor’s categorical approach, are best determined by the District Court in the first instance. For that reason, we will affirm Santos-Estrella’s conviction, vacate his sentence, and remand for resentencing in accordance with Booker.