President Obama is staying in the background, he knows Trump is beginning to unravel, and he probably feels sorry for him. He could probably say a lot, but why tarnish his reputation, when Trump will blow himself up, like he always does.
Trump blew himself up on New York State Real Estate, then he blew up two of his marriages. Then he blew up his casino, not once, but four times.
The one thing Trump is good at, is blowing himself up, unfortunately he is President of the United States, and the stakes are quite high, so Millions of Americans will get hurt again. But again these are the Republicans, every time they get into office, they mange to have wars that no one wants, financial crisis that screw Millions of Americans, and when compared to the real terrorist in the world compete with them on who can do the most damage.
Republicans once stood for something, now they have just become a party that does its best to make the rich Richer.