Trumps ego has and will continue to destroy him.
There is nobody approving Trumps tweets. Nobody telling him the significance of the debates and the need for preparation. Nobody putting him in line. And if there is someone, they must just be a head-nodder
Sure Clinton has made a few mistakes, but I can guarantee that every speech is signed off by a number of people and checked, and checked again. Likewise on social media. And that is Presidential.
Could you imagine if Justin Trudeau or Obama suddenly tweeted to tell people to check out a **** video? There would be outrage

- but because it's Trump, no one is surprised.
He is literally just such a mess and I think it's only going to get worse the next month or so. I really can't see him doing enough preparation to look competent in the next two debates. Nah. He's too in love with his ego.