Chris Christie: “What Reagan would do is if there was parts of it he didn't like, he'd get in there and negotiate it and try to make it…”

It makes this debate really crucial. It's an amazing timing by him, because it is a race for second in Iowa.

What happened this weekend doesn't erase Trump's role in the political climate, the language that he uses against his political opponents which is over the top to say the least, but in some cases, points directly to violence.

I want to promise you this, I am going to make sure that in no way do I enable Donald Trump ever be president of the United States again, and that's more important than my own personal ambition.

In my lifetime I've never seen a situation more asking for a viable third-party candidate.