It is said that politics is the art of the possible.
Trump perceives his proposition as possible. He knows that what you suggest is not
So far, nothing has happened.
It would be possible if he started deporting every single one of their azzes. The Dems would run to him for a deal. Then he should do what the Dems do....make the deal and then slow walk it so it never happens. Play by their rules for awhile.