Reps. Sanford Bishop Jr., D-Ga., and James Clyburn, D-S.C., want a federal judge in Washington to toss subpoenas for their deposition testimony in the Shirley Sherrod defamation case, arguing the lawyers who issued the subpoenas are on a “fishing expedition.”

Bishop and Clyburn were subpoenaed in the case of Sherrod, a former U.S. Department of Agriculture administrator suing the estate of the late conservative blogger Andrew Breitbart and his colleague Larry O’Connor. O’Connor’s lawyers issued the subpoenas, according to the motion to quash filed Thursday in the U.S. District Court for the District of Columbia by the U.S. House of Representatives general counsel’s office.