information subsequently provided by the detainee is, in my view, unknowable. >> reporter: john brennan admitted the cia made mistakes. >> i cannot say with certainty whether or not individuals acted with complete honesty. >> reporter: but he would not call it torture. deputy director during the bush administration when these techniques were used, waterboardings, beatings, conditions so brutal that one detainee froze to death, forced to stand on broken legs and rectal feedings. brennan said he didn't know fully what was going on back then. >> many of the things that i read in that report that were very concerning and disturbing to me. >> reporter: now democratic