The Federal Public Defender appointed to represent Gregory D. Lewis 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). Lewis has filed a response. To the extent that Lewis has raised a claim of ineffective assistance of counsel, the record is insufficiently developed to allow consideration at this time of his claim; such claims generally “cannot be resolved on direct appeal when [they have] 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). Our independent review of the record, counsel’s brief, and Lewis’s response discloses no nonfrivolous issue for appeal. Accordingly, counsel’s motion for leave to withdraw is GRANTED, counsel is excused from further responsibilities herein, and the APPEAL IS DISMISSED. See 5th Cir. R. 42.2. Lewis’s motion to substitute counsel is DENIED.