Obama is a petulant child. Mark Twain quote “Politicians are like Diapers they both need to be changed often and for the same reason.”
The Obama’s criticism of the Trumps coming into the White House will not make them to be greeted cordially by the American people.
Not from any of Twain’s works, and has been attributed to Reader’s Digest (although that’s disputable too). Not that it’s inaccurate, to be sure.