OPINION

Jacob Walker Hughes, III, pled guilty to one count of bank robbery by use of a dangerous weapon, in violation of 18 U.S.C.A. §§ 2113(d), 2 (West 2000); and one count of using and carrying a firearm during a crime of violence, in violation of 18 U.S.C.A. §§ 924(c)(l)(A)(ii), 2 (West 2000). He appeals his sentence.

Hughes’ attorney has filed a brief in accordance with Anders v. California, 386 U.S. 738, 87 S.Ct. 1396,18 L.Ed.2d 493 (1967), alleging that the district court erred in failing to award Hughes a downward departure from the term of imprisonment calculated under the Sentencing Guidelines 1 based upon Hughes’ assistance to the Government. Hughes has not filed a pro se supplemental brief, despite being advised of his right to do so. 2

This court has held that a departure on the grounds of substantial assistance to the government first requires that the government file a motion for the court to depart. See United States v. Schaefer, 120 F.3d 505, 508 (4th Cir. 1997). The Supreme Court held in Wade v. United States, 504 U.S. 181, 112 S.Ct. 1840, 118 L.Ed.2d 524 (1992), that district courts may review a prosecutor’s refusal to file a substantial assistance motion to determine whether the refusal is based on an unconstitutional motive. Id. at 185-86, 112 S.Ct. 1840. In order to invoke this review, however, a defendant must do more than make “generalized allegations of improper motive” — he must make a “substantial threshold showing.” Id. at 186, 112 S.Ct. 1840. A request for downward departure was not presented to the district court by either party in this case, and our review of the record discloses no evidence that the fail *111 ure of the Government to raise the issue of substantial assistance was based on an improper motive.

In accordance with Anders, we have reviewed the entire record in this case and have found no meritorious issues for appeal. Therefore, we affirm Hughes’ conviction and sentence. This court requires that counsel inform his client, in writing, of his right to petition the Supreme Court of the United States for further review. If the client requests that a petition be filed, but counsel believes that such a petition would be frivolous, then counsel may move in this court for leave to withdraw from representation. Counsel’s motion must state that a copy thereof was served on the client.

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.