Trump has already passed the only two critical litmus tests for me: I believe---and this an act of faith---that he will build the wall and shutdown illegal immigration; and I believe he will kick out the Syrians and not take any more.
I do not believe any other candidate could (nor would many) do this if elected.
We may get a chance to see how good he is on his word.
Not to be negative, but if the wall gets built, I wonder how effective it will be. They have been pretty good about creating alternate means to get entry including some pretty sophisticated tunnels.