Chuck Hagel: “Recent crises in Iraq and Ukraine are reminders of how dangerous, volatile, and unpredictable the world can be.”

The Chinese are watching this as relates to Taiwan, the Iranians, the North Koreans -- all countries are watching this, and watching the U.S. response to it, and the West response to it.

The facts speak for themselves, and especially when you look at the many of the witnesses, who are Trump cabinet members, White House officials in the Trump administration, supporters of Mr. Trump.

I think the GOP is in a lot of trouble. And I do think an encouraging sign, I think the strong control that Mr. Trump has exercised over the Republican Party is dwindling.

This is so unpredictable. And we've never seen anything quite like this in our lifetime, so there is no playbook here.