 And he urges Democrats to realize that he won the contest. He is the nominee. He's not standing aside. He can beat Trump, he argues. And all that is in a two-page letter. The president spent more than 20 minutes on with MSNBC's Morning Joe this morning, giving voice to that. He was on a half-hour long call with donors today, insisting that he's going to attack, attack, attack Trump at the next debate. And the White House insists that he will not be standing aside.