If we topple [Bashar] Assad, the result will be ISIS will take over Syria, and it will worsen U.S. national security interests.

I believe in a America first foreign policy, that far too often President [Barack] Obama and Hillary Clinton - and, unfortunately, more than a few Republicans - have gotten distracted from the central focus of keeping this country safe.

On his [Marco Rubio] Gang of Eight bill, he would have liberalized immigration, but he did not - and he steadfastly opposed any new border security requirements for refugees or students.

When people are motivated by principles larger than themselves, you don't have to beat them over the head to get them to act. You simply empower them, you inform them, you give them tools, and they take it upon themselves to act.

I believe you [Donald Trump] know politicians better than I do because for 40 years you've been funding liberal Democratic politicians.

What data can tell you is if you have 10 messages, all of which you believe, it can tell you which messages are resonating and which aren't. And if you break it down even further, the truth of the matter is some messages resonate one place and other messages resonate another place.

I think the people who have been finding it harder and harder to feed their kids - the young people who are afraid "I'm never going to have a job and be able to provide for a family," all of that can turn around and it can turn around quickly.