let me ask you about khalid khad shake sheikh mohammad. there was a dispute ongoing, i speaks, whether or not he being the only person who was waterboardded a substantial number of times, once or twice, whether or not the waterboard offering him produced information from him that did in fact help lead us to osama bin n laden's courier or to a phone. what's your view on that. >> guest: really nice to have this golden thread and say, ding, ding, ding, that's so obvious. but you have been in the same office i worked in, jim. never works that way. there are threads but they're hundreds, if not thousands of threads and some are good, in a fabric that get you to where you want to be. so, to just hit a couple of data points, it wasn't waterboarding that made him talk. i was sleep deprivation. we did use waterboarding but at the end of the day it was one of the other techniques. now, having said that, there is a difference in how sheikh mohammad before and after the enhanced interrogation techniques. this was totally defiant. this was a zone of mo