Why is Eric Holder in charge of reviewing Eric Holder's surveillance of journalists policy?

During Obama's national security speech yesterday, the president unexpectedly mentioned the AP and Fox News press freedom scandals. "Journalists should not be at legal risk for doing their jobs," he said, adding that he is "troubled by the possibility that leak investigations may chill the investigative journalism that holds government accountable." Trevor Timm from Freedom of the Press Foundation asks why, then, Eric Holder is in charge of reviewing Justice Department policy, when he is "the same man who has overseen the Justice Department prosecute leakers to the press at a record rate."