"We will take office as the 47th President of the United States"
Putting aside the royal "we" ...
Wouldn't he still be the 45th president still just serving whatever number of presidential terms it would be?
Like when you hook up with an ex out of loneliness, bad decisions and probably alcohol, your body count doesn't go up.
@Smersh I think he would be 45th AND 47th, should that hideous possibility come to pass (which God forbid)