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 ten years in the Central Intelligence Agency as an undercover operations officer serving overseas after 9/11 where I carried out covert operations against al-Qaeda and other terrorist groups, as well as other countries who are 'hostile to liberty,' as I like to say.

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.

Democracy demands that judges confine themselves to a narrow sphere of influence - that is why the late Alexander Bickel called the judiciary the 'Least Dangerous Branch.' In a world governed by a proper conception of their role, judges don't play at being legislators - they leave that job to our elected representatives.

I think you have to be concerned about any presidential executive order because it has the power of law until it's knocked down by an act of Congress or a court.

I want a politics that doesn't need to pretend to be holy or perfect or infallible. I want a politics that gets on with it.

The mayor has got to work closely with a wide variety of people, his city council, state legislature, governor, business community, labor community, president and the congress in order to be able to do this.