doing it. it's one of the scariest interviews i have ever done. >> okay. compare him to robert mcnamara. >> mcnamara, thoughtful, reflective, agonized about the past. rumsfeld completely unapologetic, pleased with himself. convinced absolutely in his own correctness, his own rectitude. they couldn't be more different than two people could possibly be. >> thank you so much. the film's called "the unknown known." it will drive you crazy, but you have to see it. thank you, errol morris and david corn for your expertise. the book is "hubris." the best book ever on that war. we'll be right back after this. ♪ oh-oh, oh, oh, la, la-la, la-la, la-la ♪ ♪ na-na-na, na-na-na-na-na