We do have to balance this issue of privacy and security. Those who pretend that there's no balance that has to be struck and think we can take a 100-percent absolutist approach to protecting privacy don't recognize that governments are going to be under an enormous burden to prevent the kinds of terrorist acts that not only harm individuals, but also can distort our society and our politics in very dangerous ways.

If we're trying to protect the American public, we should not put in place a travel ban.

No matter how much you've done, or how successful you've been, there's always more to do, always more to learn, and always more to achieve.

Now suddenly you got members of your [White House] team who were 23, 24. They've met their wives here, or their husbands here.

Part of the reason that our politics seems so tough right now and facts and science and argument does not seem to be winning the day all the time is because we're hardwired not to always think clearly when we're scared. And the country's scared.

Democracy is hard work.

We've got to change our regulatory system.