David Gergen: “There's nothing you can do. You can't attack him. And it's conceivable that she might even want him to be a running…”

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…

I don't think Trump is out of the woods, even though his poll numbers are not only staying up, they have actually been strengthened some.

You can't out-Nixon Nixon very easily, but Donald Trump has.

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