Why? When he can win with arguments like “She’s so nasty” and “Just words, those are just words”
Debating Hillary, Trump was most of the time completely unable to construct a reasonable come back. He will just throw everybody off with something completely idiotic.

It is rather like trying to play chess with a pigeon — it knocks the pieces over, craps on the board, and flies back to its flock to claim victory.
https://rationalwiki.org/wiki/Pigeon_chess

I’m not even sure what a winning strategy against that looks like, when about half the voters think that’s just fine.