And Incidentally: A Lot Of That Stuff Isn't In The Constitution

I meant to include this in the other thing, but I didn't and I'm too busy to make some big deal out of it anyway, but: I watched Mr. Khan doing the anti-Trump rounds the other day, and he kinda seemed to be suggesting that there were things in the Constitution that just aren't there. He did, in his original comments, refer to the equal protection clause--but I wasn't clear whether he was saying that that was grounds for a legal challenge to Trump's proposed suspension of Muslim immigration...and I don't even know whether that would do the trick, legally speaking.
Anyway.