
    UNITED STATES of America, Plaintiff-Appellee, v. Robert Henry DAVIS, Defendant-Appellant.
    No. 08-6037.
    United States Court of Appeals, Fourth Circuit.
    Submitted: March 25, 2008.
    Decided: March 31, 2008.
    Robert Henry Davis, Appellant Pro Se. Mythili Raman, John Walter Sippel, Jr., Office of the United States Attorney, Baltimore, Maryland, for Appellee.
    Before MOTZ, KING, and GREGORY, Circuit Judges.
    Dismissed by unpublished PER CURIAM opinion.
    Unpublished opinions are not binding precedent in this circuit.
   PER CURIAM:

Robert Henry Davis seeks to appeal the district court’s order treating his Fed. R.Civ.P. 60(b) motions as successive 28 U.S.C. § 2255 (2000) motions, and dismissing them on that basis. The order is not appealable unless a circuit justice or judge issues a certifícate of appealability. See 28 U.S.C. § 2253(c)(1) (2000); Reid v. Ange-lone, 369 F.3d 363, 369 (4th Cir.2004). A certificate of appealability will not issue absent “a substantial showing of the denial of a constitutional right.” 28 U.S.C. § 2253(c)(2) (2000). A prisoner satisfies this standard by demonstrating that reasonable jurists would find that any assessment of the constitutional claims by the district court is debatable or wrong and that any dispositive procedural ruling by the district court is likewise debatable. See Miller-El v. Cockrell, 537 U.S. 322, 336-38, 123 S.Ct. 1029, 154 L.Ed.2d 931 (2003); Slack v. McDaniel, 529 U.S. 473, 484, 120 S.Ct. 1595, 146 L.Ed.2d 542 (2000); Rose v. Lee, 252 F.3d 676, 683-84 (4th Cir.2001). We have independently reviewed the record and conclude that Davis has not made the requisite showing. Accordingly, we deny a certificate of appeala-bility and dismiss the appeal.

Additionally, we construe Davis’s notice of appeal and informal brief as an application to file a second or successive motion under 28 U.S.C. § 2255. See United States v. Winestock, 340 F.3d 200, 208 (4th Cir.2003). In order to obtain authorization to file a successive § 2255 motion, a prisoner must assert claims based on either: (1) a new rule of constitutional law, previously unavailable, made retroactive by the Supreme Court to cases on collateral review; or (2) newly discovered evidence, not previously discoverable by due diligence, that would be sufficient to establish by clear and convincing evidence that, but for constitutional error, no reasonable factfin-der would have found the movant guilty of the offense. See 28 U.S.C. §§ 2244(b)(2), 2255 (2000). Davis’s claims do not satisfy either of these criteria. Therefore, we deny authorization to file a successive § 2255 motion.

We dispense 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.  