white house chief of staff denis mcdonough, national security adviser susan rice, secretary of state of defense, chuck hagel, chairman of the joint chiefs of staff martin dempsey so a lot of people at that meeting sat down to assess the latest information and the risk and then after that, the president was briefed by susan rice and lisa monaco. i expect there to be more briefings and meetings that occur today. president obama due back a little bit later on this afternoon. but, alex, one of the reasons that lawmakers are so concerned, you heard them talk about it, the threat is specific, it is credible. u.s. officials telling me they are bracing for what could be a large attack that has been planned. take a listen to what one lawmaker had to say this morning. >> obviously we don't know where the location is. that's part of the problem, but what we have heard is some specifics on on what's intended to be done and some individuals who are making plans such as we saw before 9/11. whether they're going to be suicide vests that are going to be used or whether they're planning on vehicle-bo