Pro se appellant Sophia Martini appeals a district court order that denied her motion to compel the United States Attorney’s Office for the District of Maine to file a motion to reduce her sentence under Fed.R.Crim.P. 35(b). Having thoroughly reviewed the record and the parties’s briefs on appeal, we affirm the district court’s order.

We agree with the district court’s conclusion that the government could not be compelled to file a Rule 35(b) motion under the circumstances that are present here. Appellant has not alleged that the government’s decision was based on an unconstitutional motive, nor that it was unrelated to a legitimate government end. Accordingly, judicial review is not available under Wade v. United States, 504 U.S. 181, 185-86, 112 S.Ct. 1840, 118 L.Ed.2d 524 (1992). And while “the government must perform in good faith the discretionary obligations that it undertakes in a plea agreement”, see United States v. Alegria, 192 F.3d 179, 187 (1st Cir. 1999), this principle does not entitle appellant to enforce alleged oral promises that contra *2 vene her plea agreement, which makes no mention of Rule 35(b) motions and which provides that all promises will be “in writing [and] signed by the parties.” The government’s refusal to file a Rule 35(b) motion is not subject to judicial review under these circumstances. Cf. United States v. Sandoval, 204 F.3d 283, 286 (1st Cir. 2000)(holding government’s refusal to file § 5K1.1 motion was not subject to judicial review where plea agreement made no mention of such motions and defendant did not allege a Wade violation); Alegría, 192 F.3d at 186 (holding defendant could not reasonably rely on alleged pre-plea oral promise that contravened plea agreement’s integration clause). See also Bischel v. United States, 32 F.3d 259, 264 (7th Cir. 1994); United States v. Ringling, 988 F.2d 504, 507 (4th Cir.l993)(both declining to enforce alleged oral promises to file Rule 35(b) motions). Moreover, even if the government’s decision was reviewable, appellant has not made the “substantial threshold showing” required to merit further inquiry under Alegría, 192 F.3d at 189 & n. 7 (holding conclusory assertions and “sheer speculation” were insufficient to rebut government’s facially valid reasons for determining defendant had not rendered substantial assistance).

In view of the foregoing, we need not decide whether jurisdiction was available under United States v. Morales, 52 F.3d 7, 8 (1st Cir. 1995). Accordingly, appellant’s renewed motion for appointment of counsel is denied and the judgment of the district court is affirmed. See Local Rule 27(c).