He seems incapable of staying on message, whenever he even tries to tone it down he barely lasts 48 hours before he says something controversial again.
Whether it is because his ego needs to always be in the headlines or if he constantly ramps up the crazy to get TV exposure in lieu of traditional campaigning (Jill Stein has spent more on ads than he has!) the pattern of escalation suggests we haven't seen the worst yet unfortunately.
Even if I supported him it would seem a daft strategy as he frequently overshadows campaign missteps by Clinton.
Prior to the Brexit vote I'd be confident that such bewildering behaviour could never obtain office, but after that nothing would surprise me.