Cheney and Libby often acted without the knowledge or approval and of other senior White House staff when it came to their efforts to discredit Wilson -- including leaking classified information to the press.

Murray continues:

The federal grand jury indictment of Libby states: "A major focus of the Grand Jury Investigation was to determine which government officials had disclosed to the media... information concerning the affiliation of Valerie Wilson to the CIA, and the nature, timing, extent, and the purpose of such disclosures, as well as whether any official making such a disclosure did so knowing that the employment of Valerie Wilson by the CIA was classified information."

In his interviews by the FBI and testimony before the federal grand jury, Libby testified that it was the reporters who told him, and not the other way around, that Plame was a CIA officer. Prosecutors are expected to argue during the trial next week that Libby lied because to tell the truth Libby would have to admit that he leaked classified information and might politically embarrass the White House. But the prosecution may very well subtly make the case that another motive was for Libby to protect his then-boss, Cheney. In private, some federal investigators have asserted that Libby might have lied from the beginning to protect Cheney.

This is another important piece from Murray. I recommend you all read it.