The attorney appointed to represent Ignacio Engunzo Lopez, Jr., has requested *332 leave to withdraw and has filed a brief as required by Anders v. California, 386 U.S. 738, 87 S.Ct. 1396, 18 L.Ed.2d 493 (1967). Lopez has filed a response challenging his sentence and asserting ineffective assistance of counsel.

Our independent review of the brief, Lopez’s response, and the record discloses no nonfrivolous issues for appeal. We conclude that the record is insufficiently developed to allow consideration on direct appeal of Lopez’s claim of ineffective assistance of counsel. See United States v. Brewster, 137 F.3d 853, 859 (5th Cir. 1998). Accordingly, without prejudice to Lopez’s right to file a motion pursuant to 28 U.S.C. § 2255, counsel’s motion for leave to withdraw is GRANTED, counsel is excused from further responsibilities, and the appeal is DISMISSED. See 5th Cir. R. 42.2.