David Gergen: “Mitt Romney's nationwide lead is collapsing.”

The midterms really helped him. They transformed the race, best midterm elections for any president in 20 years.

I think the turning point that came were the midterm elections. The fever broke with those midterm elections. And what we've seen since then is a steady decline in Trump's credibility and in his position with the American people, and a…

If he had a receptive audience, and I will tell you, when everything -- when all the facts were to come out, it would be like Nixon and the tapes.

If he comes out and throws cold water on this, then I don't think it goes anywhere.