"RUSH: So President Trump and the first lady, Melania, just boarded Air Force One at Joint Base Andrews en route to where we live to screw things up for about three or four days. I say that affectionately and jokingly. But I got an email from somebody. “Rush, I just saw the president do the rudest thing. It’s raining, and he got on board the plane before Melania. How rude is that?” You know, that’s an excellent question, and let me tell you why it happened. In official Washington protocol, no one goes through a doorway before the president. No one."
https://www.rushlimbaugh.com/daily/2017/04/06/nobody-goes-through-a-doorway-before-the-president/