Democrats can demand leak investigations, too. On Thursday, Rep. Jarrold Nadler (D-N.Y.), the top Democrat on the House Judiciary Committee, sent a letter to Deputy Attorney General Rod Rosenstein and FBI Director Christopher Wray asking them to investigate who leaked the name of a confidential FBI and CIA informant who approached advisers to President Trump's campaign in 2016, apparently to find out if Russia was trying to use the aides to influence the election.