and so for secretary of state rex tillerson, who is new to being a diplomat but has had a lot of experience dealing with heads of state in his role when he was the ceo of exxon, and for john kelly, who is of course formerly a general, now in this role of one of the toughest departments, homeland security, which has to implement the new executive orders for the president, they deal with things like the new rules that would make it easier and faster for the united states to send, especially mexican border crossers back when there had been a plan prior to that where they could be -- if they were apprehended they could remain in the united states pending a court process. s that witness of the many elements of these new yards. diplomatically, what a tall order for these two secretaries to go to mexico and to try to find some area of common ground. notably, the president acknowledges, it's a tough trip. craig. >> a rough slog, indeed. kelly o'donnell for us at 1600.