As I have noted before, political correctness is at heart the belief that certain persons' emotions are an infallible oracle into Truth with a capital T. The different strains of political correctness differ in identifying the elect. The Trump movement is all emotion, all the time, and relies on the emotions of his base.
Political correctness also emphasizes identity politics. The Trump phenomenon has that base covered, too.
Another aspect of political correctness is its view of government as the cure for whatever ails you, with narrowly defined exceptions. Trump fits that one.
Some have said that Trump holds a mirror to the American people. The view in the mirror includes those who have pushed American thought in the direction of political correctness.