Chris Christie: “I'm worried about this man dying in office.”

This is against type for him. I'm sure it was a difficult decision. I think his analysis was, he cannot live with a nuclear weapon in Iran, and Israel did all of the heavy lifting.

I didn't see a path to beating Donald Trump.

I think it's a very tight, concise decision. I don't think there's any grounds for appeal.

What poses a national security risk is the possibility that he could be president of the United States again.