Did Panetta Threaten To Resign?

ABC News, citing senior administration officials, says "yes." The CIA and other officials say the story is a "lie."  Who's right?  For the sake of Panetta's main audience -- CIA employees -- his threat to resign over a matter of principle to him is probably a good thing, if it happened at all, so I don't think CIA quite minds the story as much as one might think.  The ABC story includes references to discontent at the highest levels of the administration with the president's national security team, and yet the evidence for that is nil: indeed, John Brennan, the president's top counterterrorism adviser and a man whose imminent resignation is often rumored, just saw his portfolio expand to include oversight of a new interrogation program.  And whatever's wrong at CIA has little to do with Panetta and more to do with the legacy of institutional and personnel decisions made by the former administration.