(NEWSER) – The Justice Department's secret subpoena of AP phone records might not have been a one-time occurrence. Eric Holder tells NPR that he has no idea how many times he'd allowed the department to snoop on journalists. "I'm not sure how many of those cases … I have actually signed off on," he said. "I know that I have refused to sign a few [and] pushed a few back for modifications." Holder also wouldn't promise to review the policy allowing such record seizures.