to the wall, that's false too. fbi data shows that over the span of five years both before and after the wall was built, el paso's violent crime increased. so bottom line, el paso was never one of the most dangerous cities in the u.s. and a wall did not solve any problems with crime it may have had and those folks are just the fact. let's bring in political reporter chris cillizza and when asked whether he would declare a national emergency, the president says i'm considering everything, so give us the historical context for this? how does this emergency compare to others? >> let's run through it. thank you for doing, in fact, check segment. let's get through some more facts. facts. okay. first of all, broad scale, 1976 the national emergencies act is passed which tries to sort of make specific what you can and can't do but national emergencies have been declared before that. let's run through the big ways in which they're declared,