David Gergen: “It could be -- as I say, it could be -- it could have weight to a case against the president.”

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.

I think it's going to take something usually unexpected or a dramatic change in his health or a prison sentence to stop him.

He is a leader there's no question about that. But I think he's a bad leader. I think he's leaving his people into, he's leading the country, especially into a very bad place.