If that happens (once only) the Constitution can be modified, resulting in: USA = RUSSIA !
Yes, I can see that is possible.(Theoretically)
But just think how "Unlikely" it is, and even more unlikely for such a drastic change.
The most likely scenario is (as reported on a post election news cast) that DT is a deal maker (remember Real Estate) and he will
propose the most "way out there" plan, and then settle for the best deal he is going to get.
He will build a wall, but it will be more rhetorical then actual. It certainly won't be the full Mexican border.