NEW YORK AP – A lawyer for the TV news producer accused of blackmailing David Letterman plans to ask a judge to dismiss an extortion case that prompted the late-night comic to acknowledge affairs with staffers.

Robert J. “Joe” Halderman is due in a Manhattan court Tuesday. His defense attorney, Gerald Shargel, said he planned to challenge whether the evidence presented to a grand jury was sufficient and ask a judge to dismiss the attempted first-degree grand larceny charge against his client.