[Cooper called Libby directly, Abrams told NPR, and was referred to his lawyer for authorization. Abrams said he specifically remembered talking to Tate about the waiver.] It was made very clear to me in discussions with Mr. Libby's counsel that he had personally approved and authorized Matthew Cooper fully to disclose everything about their conversations, ... I was satisfied that I had been given a direct and unequivocal assurance that Matt could testify and Libby had approved that.