Joseph Michael Dixon seeks to appeal the district court’s order denying relief on his motion filed under 28 U.S.C. § 2255 (2000). We have independently reviewed the record and conclude that Dixon has not made a substantial showing of the denial of a constitutional right. Miller-El v. Cock-rell, — U.S.-, 123 S.Ct. 1029, 1039-40, 154 L.Ed.2d 931 (2003). Accordingly, we deny a certificate of appealability and dismiss the appeal. See 28 U.S.C. § 2253(c) (2000). We deny Dixon’s motion to file a supplemental informal brief. We *207dispense with oral argument because the facts and legal contentions are adequately presented in the materials before the court and argument would not aid the decisional process.

DISMISSED.