We need some way to prosecute them for treason (specifically, aiding and abetting a foreign invasion). The problem is that they would be aquitted by any Democrats or Chamber-of-Commerce Republicans who are on the jury. Some sort of military tribunal, perhaps?
I think Donald Trump is trying to wrap all the measures up into a humane package deal. Limited amnesties to the DACA crowd, a robust Wall, and robust enforcement of the measures that remain as well as removal of incentives for gate crashers to keep on crashing the gates. Nobody is going to be entirely pleased. But it needs to be morally acceptable; our current gate crashers were largely nodded and winked through the gates.