The investigators had much of this information before they sat down with Libby on Oct. 14, 2003, and first heard from him what prosecutors now allege was a demonstrably false version of what happened. Libby said that, when he told other reporters about the CIA operative and her marriage to Iraq war critic Joseph C. Wilson IV, he believed he had first learned the information from Tim Russert of NBC News and was merely passing along journalistic hearsay. This was an explanation made dubious by Libby's own notes, which showed that he previously had learned about Plame from his boss, Cheney.
To critics, the timing suggests an attempt to obscure Cheney's role, and possibly his legal culpability. The vice president is shown by the indictment to be aware of and interested in Plame and her CIA status long before her cover was blown. Even some White House aides privately wonder whether Libby was seeking to protect Cheney
Yes, he may have been doing just that, and now he may be trying to take the fall to protect him, and others within the administration. Remember, he was on both the Vice President's and the President's staff.
With Rove being questioned again, it is clear that more Republicans may soon be facing criminal charges.