Don’t you know his highness Emperor Barack Hussein 0bama does not any authorization. How can you ask such a question. *Tsk tsk*
“Highness” is a prince.
“Majesty” is a sovereign.
Technically a President might be “Excellency” but I have a lot more respect for a waitress at Waffle House than I do for the current occupant of the White House. (Actually, I have a lot of respect for a good waitress so that might not be a good comparison...)