Three things spring to mind: 1. He could have obtained warrants for phone taps from the Foreign Intelligence Surveillance Court. 2. I think AQ figured out that their comms had been penetrated when a lieutenant of OBL had a JDAM fall on his head when he tried to use his boss's sat phone. 3. Cheney has said elsewhere that such action could have prevented the 9/11 attacks, conveniently overlooking the fact that the time NSA was already swamped with raw intel and couldn't process it fast enough. What is really starting to grip my sh1t about this guy and his poodle in Downing Street is the contempt with which they treat everybody when their abuses and ineptitude is displayed for the world to see.