>> we are the first reporters allowed inside one of their national meetings. >> any threat to the homeland, any place where u.s. forces are deployed. any place u.s. personnel could be at risk. >> from agency to agency we heard a consistent list of threats and adversaries. >> he was president obama's briefer for four years. >> it's a high-pressure job. >> it is. >> what is the toughest moment you can remember? >> there is a number of occasions in which i was in there on a friday morning and was briefing about here's the intelligence assessment about the weekend activity and coming in on the monday morning and going, well, here's what we missed. >> or seeing this happen on a friday night, paris under attack by isis gunmen and bombers. some of them french citizens. several of the attackers and the alleged mastermind, abdelhamid abaaoud were previously known to european and u.s. intelligence. >> how did they miss an attack of this scale? >> the sheer of radicalization in europe is like nothing they have ever dealt with before. we're talking about tens of thousands of people who have become radicalized in shop way, shape, or form. there is just too many people to watch intensively. >> there's not that many takers