It was very clear, even from long before Donald Trump got in this race, when he would talk to Republicans, the number-one concern they had about Jeb Bush was whether he was too rusty for this, and whether he was going to be strong enough to stand up to Hillary Clinton.

The real problem with Donald Trump is, if you engage him, it will only make things worse. It's like - it's a little bit what you were taught as a kid to not engage the bully, because they will continue to pick on you.

I still think there's some tension . But it's pretty clear that, when the president made his statements as a candidate, he's following through with those as a president.

If you're Chris Christie, who is governor of New Jersey, a state that obviously was impacted by 9/11, this gives you an opportunity to talk about how, as governor, you had to deal with terrorism and security issues.

The ones who are in the Senate have to have a position.

I think you still have a problem here when you're going and you're looking not just that Trump is winning, but he's winning in a broad swath of voters. It's not just that he's got this one lane, oh, he only wins when there's low turnout, he only wins when conservatives, he only wins in these kinds of states. He wins enough across a broad array.

It's never a good time, when you're the president of the United States and your own party is finding lots of different ways to distance themselves from you.