The only substantial thing Donald Trump has going for him is that he is a Washington outsider. That is what got him elected. It would be a terrible error to surround himself with Political insiders such as Romney, Giuliani, or Patraius.
As for Ben Carson, he may be a smart man but he has no executive experience, and a huge negative is his 7th Day Adventism. Non-Christians will not want him because of his faith, and Christians will not want him because his cult teaches that all of us who worship on Sunday will be executed at the return of Christ.
Better keep looking.