**FILE PHOTO** Attorney General Eric Holder speaks to reporters in Washington in this Nov. 13, 2009 file photo. During his confirmation last year, Holder failed to notify the Senate that he had signed several briefs urging courts to reject President George W. Bush's claim that he had the power to imprison an American citizen as an "enemy combatant," the Justice Department acknowledged Thursday, March 11, 2010. (Doug Mills/The New York Times)