David Gergen: “He hasn't produced as best I can tell one single credible witness on his behalf and he has a responsibility to people to…”

For Donald Trump to go for a 24-plus hours without a word being said is an outrage in and of itself. This is a man who is seeking the nomination of a major political party, very likely to get it. And now look at the leadership he is…

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

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.