>> i think that's about right. i think vice president cheney saw his singular mission to prevent another 9/11 and nothing was going to be a higher priority to him than that that stayed pretty constant through the end of his term whereas president bush began trying to adjust to recalibrate, to see where things were going wrong, so if he couldn't find different ways of doing things. he started closing some the secret prisons that the cia was running. he went to congress on surveillance and myrtle tribunals. he decided to give condoleezza rice a chance to try the middle east things. those are things to vice president cheney were objectionable. president bush wanted to try a different way. how painful was it no weapons of mass destruction in iraq how painful was it? >> sort of a daunting realization. the reporting of this and we interviewed about 275 people including vice president cheney and lots of others. i never found of sort of an ah-ha moment a moment where they said boy it didn't exist. daunting revelation that clearly impacted the relationship. i think president bush began as iraq went bad, as the