The attorney appointed to represent Bryan Munson Ewing has moved for leave to withdraw and has filed a brief in accordance with Anders v. California, 386 U.S. 738, 87 S.Ct. 1396, 18 L.Ed.2d 493 (1967), and United States v. Flores, 632 F.3d 229 (5th Cir. 2011). Ewing has filed a response. The record is insufficiently developed to permit consideration of Ewing’s claim that his guilty plea was made under coercion and duress. See United States v. Corbett, 742 F.2d 173, 176-78 (5th Cir. 1984). He may raise such a claim in a 28 U.S.C. § 2255 motion. See id. at 178 n. 11. Likewise, the record is insufficiently developed to allow consideration at this time of Ewing’s claim of ineffective assistance of counsel; such a claim generally “cannot be resolved on direct appeal when the claim has not been raised before the district court since no opportunity existed to develop the record on the merits of the allegations.” United States v. Cantwell, 470 F.3d 1087, 1091 (5th Cir. 2006) (internal quotation marks and citation omitted).

We have reviewed counsel’s briefs and the relevant portions of the record reflected therein, as well as Ewing’s response. We concur with counsel’s assessment that the appeal presents no nonfrivolous issue for appellate review. Accordingly, the motion for leave to withdraw is GRANTED, counsel is excused from further responsibilities herein, and *682the APPEAL IS DISMISSED. See 5th Cir. R. 42.2.