Trump at the beginning had Kelly Ann Conway and Corey R. Lewandowski to try and keep him focused and on message, and they did a pretty good job. Who is now trying to do that, sorry Trump needs a keeper and now.
It’s not a matter of “staying on message,” really.
The problem is that there are a lot more people in the game now, everyone trying to get air time for their views or to satisfy their own need for attention. And the errors have to be countered at every instance; you can’t just let the negative stuff hang out there as if it is correct.