I think this is only a reason to worry if you believe that Trump is capable of sticking the tone and themes in his June 7 speech. I just don't think he can do that. Trump can be reigned in for brief periods of time, when he has such a bad week that even Trump starts to realize his usual shtick is hurting him. But I don't think it will last. Maybe they can get him to use a teleprompter and stick to his prepared text when he gives a formal speech from now on. But as long as Trump has a twitter account, gives interviews, or speaks to anyone without a prepared text, he is going to say something off the cuff which will go off-message and will probably highlight the fact that he is an ill-informed racist buffoon.