Cedric Ray Tatum, federal prisoner #33588-077, appeals the district court’s denial of his motion to compel the Government to file a motion for reduction of sentence pursuant to Fed.R.Crim.P. 35(b) and 18 U.S.C. § 3742(a).

Neither § 3742 nor 35(b) provide a jurisdictional basis upon which to entertain Tatum’s motion. See United States v. Early, 27 F.3d 140, 141-42 (5th Cir. 1994). The Government’s refusal to file a Rule 35 motion is reviewable only if it is based on an unconstitutional motive, which Tatum does not allege. See United States v. Sneed, 63 F.3d 381, 389 n. 6 (5th Cir. 1995). Tatum’s motion is thus unauthorized and without jurisdiction. Accordingly, the appeal is DISMISSED for lack of jurisdiction.