[Donald ] Trump is more important than all of us. He's more important than the media.

I like [ Rick] Santorum personally and respect him, but you wouldn't say that he was really that strong of an opponent. At the end of the day it wasn't like [Ronald] Reagan running against [George] Bush, or [George W.] Bush against [John] McCain, even. It's sort of surprising that Romney had as much trouble as he did, and I think it shows a weakness in appeal to those voters.

At the end of the day,[Mitt] Romney was pro-life, but [Rick] Santorum was more fervently pro-life, and had been for longer. They're all going to repeal Obamacare, but Romney has once endorsed something like it. In the old days, there really were differences on fundamental issues, even on foreign policy, [for which] [Newt] Gingrich, Romney, and Santorum were pretty similar.

The repealing and replacing of Obamacare is very complicated. It is what a White House and congressional leadership, serious White House and serious congressional leadership, should meet on and work on and figure out a strategy of, and it may work and it may not. Obviously not every administration gets things through, even when they have much larger majorities in congress and a much larger popular vote than Donald Trump had.

If you look at the polls - the conservatives are fine.I think there will be a fair amount of enthusiasm, or at least motivation. They very much want to remove President [Barack] Obama.

He should release the tax returns tomorrow. It's crazy. You've got to release six, eight, ten years back tax returns. Take the hit for a day or two. He has to give a big speech in defense of capitalism, and that will elevate, I think, this race above this tactical back and forth, which I do think he's on the margin of losing.

If President [Barack] Obama - President [Donald] Trump shows up with a, you know, cleaver and just says, I can get rid of all these regulations, I can get rid of ObamaCare, no problem at all, then that would be a mistake.