Fitzgerald Knew Identity of Leaker From Start: "The official has been identified by attorneys and four current and former White House officials as John Hannah, a senior national security aide on loan to Vice President Dick Cheney from then-Under Secretary of State for Arms Control and International Security Affairs John Bolton.
Hannah worked with Libby on the issue of weapons of mass destruction as part of an informal team known as the 'White House Iraq Group.' Hannah told friends last year that he was worried he might be implicated by the investigation, according to a report in the Washington Post.
Libby was indicted on five counts of perjury, obstruction of justice, and lying to investigators related to his role in the leak. Hannah was named Cheney's national security adviser the day Libby was indicted.
Hannah's cooperation early on in the leak investigation ultimately helped Fitzgerald and his staff discover the identity of the Bush administration official who leaked information about Plame Wilson's work with the CIA to Novak, these sources said.
The identity of the individual is still unknown. No one in the White House was aware that Hannah was cooperating with the special counsel, the sources said, adding that information Hannah provided to Fitzgerald was instrumental in securing a perjury indictment against Libby. Hannah's attorney did not return numerous calls for comment."