David Gergen: “This is the biggest gamble I've ever seen a presidential candidate take in modern history because John McCain was in a…”

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

I think a lot of Americans do see it as disqualifying. And they're worried about it.

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.

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.