I am convinced Trump doesn't really want the wall. This whole episode is just that .... another episode of Celebrity Apprentice President: The Wall.
Trump is enjoying center stage carrying the banner of those (I will make no disparaging comments here) who think this wall is going to solve their problem (no disparaging comments here either). If Trump really wanted the wall, he would have traded for it. There was a deal to be had, as evidenced of a year ago.
No, what we are watching is a twist on the dog chasing the car. Its all about the chase. The problem is, however, the chase has taken him too far from home. Now, Trump has two exits that give him the illusion that he went to the matt for this people: 1) let a veto happen, but I think that actually makes Mitch look like the bad guy or 2) declare an emergency and let the courts veto him, which hopefully they do lest we have all kinds of problems in the future.
Trump doesn't fundamentally believe anything except the conspiracy theories (which is typically of insecure guys). He loves playing the omnipresent, omnipotent, POTUS on TV, however. The hour is almost up, the episode has to end.... unless, of course, this is a cliffhanger.
I worry, however, that what I am really watching is the Twilight Zone.