I'm not sure why you are playing dumb, but I will keep feeding you I guess.
A handler isn't just 1 person for all of his presidency, its the person that has asked him to be somewhere specific. Like if he is speaking to house democrats then it would make sense that Nancy Pelosi has asked him to be there and has asked him to speak on certain things and weather or not to take questions or not. So in this case Nancy would be the "handler". That's just my opinion though, I could be wrong, which I have no problem admitting, unlike some other people.