David Gergen: “It's serious. He generally went after him about his positions on issues. But he also dragged him through the mud…”

We're entering some kind of the most dangerous days of Donald Trump's presidency. He is erratic.

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

No, their problem is Anderson, he's got more support back in their districts in their states than they do and that gives him enormous -- it gives him enormous leverage against them.

You can stand up and say we shouldn't be doing this because it's unconstitutional. Therefore, I never have to come to say whether I agree or disagree whether he incited the riot.