by tillerson and reaffirmed by general mcmasters the national security advisor is to reassure congress that the cruise missile strike on the air base had the very narrow focus of deterring further use of weapons of mass destruction. the trump administration cannot make a no notice change in strategy, for example, regime change, without triggering some kind of congressional call for an authorization for military force and weeks and weeks of debate. that all has to take place at some point because that's what is ultimately have to happen. in the short term what we have to make sure is they don't use more chemical weapons against the people of syria. >> shannon: of course, secretary tillerson heading into moscow tomorrow to talk with russian authorities. we have a brand-new sound bite from him. i want to play it and get your reaction. >> if you violate international norms and violate international agreements, if you fail to live up to commitments, if you become a threat to others, at