Which he has clearly stated he doesn’t want to do.
But even legalizing all those here would do in the country, as they would become citizens and by chain migration triple in number to 60M+ new, primarily, low-skill, government-dependent, Leftist voters from Latin America.
Regardless of the new president’s views, the decision on immigration will be made by the Congress. The new President will likely not veto an immigration law crafted by both houses of a Republican congress