David Gergen: “I think lowering the -- what is defined by success, defining it down, so to speak, is probably the option we're going to…”

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

He is unfit for office right now.

I think we're in an unsustainable path. It's compared to being in a car on the edge of a cliff, and middle of the night with it with a rainy and no headlights.

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…