Marco Rubio in Fox News Sunday interviews during 2015

On Foreign Policy: Opposes nuclear deal with Iran; but supported deal in 2012

A: Who would not be in favor of a deal if it would be a deal that Iran would allow themselves to walk away from any sort of enrichment or reprocessing? But that's not what the deal is. We now know what the outlines of the deal are and they're much worse than anybody anticipated. And in terms of saber rattling in our approach to terrorism: When you give these radical groups safe havens, whether it's in Syria or Iraq or Libya, they use those safe havens to carry out attacks against Americans and our allies, and increasingly here in the homeland.

On Immigration: Comprehensive immigration reform is politically infeasible

RUBIO: It's not that we bailed. It's that we don't have the votes to pass it. In fact, we have less votes for comprehensive immigration reform today than we did two years again when that passed, because of the last election, because of unilateral actions the president took through executive order, because of a border crisis, because of minors. So I still believe we need to do immigration reform. I still talk about that on the campaign trail. I outlined it in my book, "American Dreams." The problem is, we can't do it in one big piece of legislation. The votes aren't there.

On War & Peace: No mistake to invade Iraq in 2003; we thought Iraq had WMDs

RUBIO: Well, not only would I have not been in favor of it, President Bush would not have been in favor of it. And he said so.

Q: So, it made sense to invade Iraq in 2003, but now you say it was a mistake?

RUBIO: That was not the same question. The question was whether it was a mistake. And my answer was it's not a mistake. I still say it was not a mistake, because the president was presented with intelligence that said Iraq had weapons of mass destruction, it was governed by a man who had committed atrocities in the past with weapons of mass destruction.