OPINION

Troy Lemont Perkins was convicted of conspiracy to possess with intent to distribute cocaine base in violation of 21 U.S.C. § 846 (2000). He was sentenced in January 2001. Perkins filed a habeas motion in the district court pursuant to 28 U.S.C. § 2255 (2000). On March 27, 2002, Perkins filed a “Motion for Release on Bail Pending Decision on Petitioner’s 28 U.S.C. § 2255.” The district court denied this motion in a marginal order on July 8. Two days later, Perkins filed a “Request for Certification for Interlocutory Appeal Pursuant to 28 U.S.C. § 1292(b) and Fed. R.Civ.P. 54(b) Certification.” The district court construed the motion as a notice of appeal. Perkins objects to this characterization in his informal brief, arguing that this appeal is interlocutory because he filed his “Request for Certification” under the assumption that the district court would enter a final order disposing of the motion from which he could appeal. *

We may exercise jurisdiction only over final orders, see 28 U.S.C. § 1291 (1994), and certain interlocutory and collateral orders. See 28 U.S.C. § 1292 (2000); Fed. R.Civ.P. 54(b); Cohen v. Beneficial Indus. Loan Corp., 337 U.S. 541, 69 S.Ct. 1221, 93 L.Ed. 1528 (1949). A “final order” is defined as one that ends the litigation on the merits and leaves nothing for the court to do but execute the judgment. Catlin v. United States, 324 U.S. 229, 233, 65 S.Ct. 631, 89 L.Ed. 911 (1945). In contrast, to fall within the collateral order doctrine, an *669 order must: (1) conclusively determine the disputed question; (2) resolve an important question independent of the merits; (3) be effectively unreviewable on appeal from a final judgment or so important that review cannot wait; and (4) present a serious and unsettled question upon appeal. See Carolina Power & Light Co. v. United States Dep’t of Labor, 43 F.3d 912, 916 (4th Cir. 1995).

The Supreme Court has long held that a pre-trial order denying a motion to reduce bail in a criminal prosecution is appealable as a collateral order. See Stack v. Boyle, 342 U.S. 1, 12, 72 S.Ct. 1, 96 L.Ed. 3 (1951). We agree with the majority of the circuits that have extended the collateral order doctrine to encompass an order denying a motion for release on bail pending disposition of a motion to vacate under 28 U.S.C. §§ 2254, 2255 (2000). See, e.g., Lee v. Jabe, 989 F.2d 869, 870 (6th Cir. 1993); Dotson v. Clark, 900 F.2d 77, 78 (6th Cir. 1990); United States v. Smith, 835 F.2d 1048, 1049 (3d Cir. 1987); Martin v. Solem, 801 F.2d 324, 328 (8th Cir. 1986); Guerra v. Meese, 786 F.2d 414, 418 (D.C.Cir. 1986); Cherek v. United States, 767 F.2d 335, 337 (7th Cir. 1985); Iuteri v. Nardoza, 662 F.2d 159, 161 (2d Cir. 1981).

To prevail on a motion for release on bail in a habeas case, the appellant must show that his petition presents a substantial constitutional claim upon which he has a high probability of success, and that extraordinary circumstances warrant his release. See Aronson v. May, 85 S.Ct. 3, 13 L.Ed.2d 6 (1964). Upon careful review, we conclude that Perkins has not made such a showing.

Accordingly, we affirm the judgment of the district court. 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.

AFFIRMED.