If there is anyone who should not be trusted with regard to intelligence, it is Donald Trump, both in the literal sense and with regard to our intelligence services. He shouldn't have access to these briefings.

I spent over 10 years in the Central Intelligence Agency, serving overseas, serving in the Middle East. And let me tell you, if you're a terrorist and you want to come to the United States, the worst possible way to do it is as a refugee. You'll go through a year and a half to two years of vetting.

Obviously, having served in wars myself, I'm eager to do everything possible to avoid them, but our military capability vis-a-vis a country like Iran is a major source of leverage in any negotiation that we should never, ever give up.

As far as a wall is concerned, the experts actually say that in some places a wall is necessary, in other places a double wall is necessary, and in other places that a wall wouldn't help. So I'm for whatever it takes to secure our border with Mexico. We've got to do it. I'm for then enforcing our laws.