He's devastating the farm belt economically. He has totally alienated every single minority. He didn't make Mexico pay for a wall. The great healthcare plans he promised evaporated. The "Best People" turned out to be the very worst and he didn't Lock Her Up. The list of things he has done that will COST him votes is almost endless.
Seriously...it's over for this clown in 2020. I'm not sure why anyone thinks he has any chance at all of winning. He was a fluke in the first place and living proof that the electoral college has twice failed seriously.