David Gergen: “The main option is sanctions.”

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 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.