WASHINGTON (AP) — Lawyers for Sen. Ted Stevens have asked ajudge to declare a mistrial in his corruption case because they claim prosecutors withheld evidence that would help their defense. The request interrupted testimony on Thursday and threatened to throw the trial into disarray. Judge Emmet Sullivan lashed out at prosecutors, asking them, “Why shouldn’t I dismiss the indictment?” He then ordered a recess. Prosecutors said it was an honest mistake when they waited until late Wednesday night to turn over FBI reports about interviews with the government’s star witness, oil pipeline contractor Bill Allen. Allen was due to return to the witness stand on Thursday. He testified Wednesday that he never billed Stevens for renovations on the senator’s cabin.