David Gergen: “I think the Republicans need to have an intervention.”

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

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…

It's very, very big. Not legally, but politically, it's a very, very big deal.

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…