Trumps’ carelessness with words leads him to places in public discourse that he shouldn’t go. Then his ego kicks in when his words are attacked and he can’t let it go or correct it in time to end the controversy without damage to his brand.
Giving all his enemies this many opportunities to attack him and then doubling down is the way to defeat, but he can’t or won’t change the subject to Hillary.
Got to remember, this August, folks are still doing vacations, the olympics are still on, and until Labor Day weekend, folks do not pay any attention to politics.