what is a post-truth world? >> i kind of describe a three layer cake. the first layer isn't the administration. it's us. it's our society moving into this post truth culture. a culture where we don't, as often use evidence and data to base our decisions. now rely on emotion, preference, feeling, grievance, loyalty, tribe. the president saw that as a candidate. i think he exploited it as a candidate. i think he worsens it by some of the things he does and a lot of things he says as president and then just to make it even more complicated, you've got the russians coming in over the top exploiting a and b that i've just described. >> you say in the book that you yourself were not fan of the iranian nuclear agreement, not fan of the jcpoa. is the president acting on the