>> this is a hypothetical. this is a philosophical subject for most. but not for you. khalid sheikh mohammed, the number one guy from al qaeda that we captured, you personally waterboarded him. did you get anything out of him of value? >> well, we did get stuff out of him of value. we got information out of him that allowed us to catch other people and ultimately through those other people disrupt that other second wave of attacks that was coming. ambali was already working on training folks to try planes into the tallest buildings in los angeles, and chicago. that plan was initially put off kilter by president bush, his attack, but ultimately they were getting that back on schedule. and without the i.t. program, they would have had a chance to pull that off. >> i read your book.