Trump is like that old showman who thinks there is no such thing as bad publicity.
I predict (under caveat of the current situation) Mr Trump will win the 2020.
So ... I concluded (many disagreed but for me it explained what was happening very well) in the 2016, the media gave Mr Trump some $2B worth of free publicity, because it believed he was a joke of a candidate, and that exposing him for what he was and continues to be, it believed no one in their "right" mind would vote for him. Yeah I understand he is the voice of their discontent .... the voice of bigotry .... and the voice of the carnival barker who would stick it to everything not them.
Press forward to 2020 .... where is the Democrat candidate? The only candidate seen is Mr Trump. Not only does he get the publicity for being occupant of the WH, but he gets the same free publicity of a candidate. It's clear the only thing he comprehends is the state of his personal "fortune". I suspect the Democrat candidate will not have enough time to recover for a vigorous political fight.
Mr Trump wins by default ...