David Gergen: “Mick Mulvaney is I think the weakest Chief of Staff in modern history.”

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

The midterms really helped him. They transformed the race, best midterm elections for any president in 20 years.

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…

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.