border safe, all of that is fine. >> well, you have to see what you're talking about here. does it contribute in a smart way to our security. certain physical barriers can make sense along the border, and in a lot of places you already have that. >> i have a solution. there is no question that president trump has the authority to declare a national emergency. the controlling case is youngstown sheet and tube v. sawyer. 343 u.s. 579. the critical operational issue is that only money already authorized and appropriated by congress can be spent. the only serious source of funds are in the military construction bill. this week there was some debate whether that money would come from a line item of $13.1 billion covering housing in afghanistan and iraq or a $13.9