To be honest, this is what both parties backed before Trump. The Democrats at this point have been in an issue on this because Trump has repeatidly made this that about everybody coming from that way is a monster, drug dealer or killer.
And all for an amount of money that would not even build the wall he wants to protect everybody from the apparent never ending flow of monsters.
If anything, Trump has made the well toxic, more than before. Even if he gets what he wants through national emergency declaration he still does not get the full wall and his rhetoric about all of this makes him a liar.
His best hope from PR is to do that and have a court stop it. Otherwise, it is now an out for presidents to do as they want on a massive level without legislative approval, when they cannot effectively negotiate their way.
I have withdrawn my original statements from this reply but I stand behind them.