According to Little Miss Manners, "The rule is that there is only one president of the United States at a time; therefore, the title does not accompany anyone out of office."
Pretty sure 'President Donald J. Trump' whether he's in or out of office 😉
That is untrue. Past Presidents are always refered to as Mr President even when they are out of office. It is a gesture of respect. Miss Manners can pound sand. I bet I've been alive alot longer than she has.
