What is the test for denying a motion to withdraw only for abuse of power?

We review a district court's denial of a motion to withdraw only for abuse of discretion. See, e.g., Fleming v. Harris, 39 F.3d 905, 908 (8th Cir. 1994); Washington v. Sherwin Real Estate, Inc., 694 F.2d 1081, 1087 (7th Cir. 1982). District courts are due considerable deference in decisions not to grant a motion for an attorney's withdrawal. See, e.g., Washington, 694 F.2d at 1087. The trial judge is closest to the parties and the facts, and we are very reluctant to interfere with district judges' management of their very busy dockets.