The single biggest threat that we face is a nuclear weapon or some weapon of mass destruction. What that means is that we have to be extraordinarily aggressive and vigilant in controlling nuclear proliferation.

Operation Iraqi Freedom is over, and the Iraqi people now have lead responsibility for the security of their country

I can think about what [Mahatma] Gandhi said or [Martin Luther] King said about violence begetting violence, and still be true to my job by asking myself the question whenever we're confronted with a situation where some may be arguing for military action: Will this actually result in America being safer, or the most lives being saved?

Our intelligence communities spend a lot of time and effort gathering a lot of strands and a lot of data [on Russian hacking]. There are times where they're very cautious and they say, "We think this is what happened, but we're not certain."

The fact is that I'm also friendly with Tom Coburn, one of the most conservative Republicans in the United States Senate, who, during his campaign, once said that it might be appropriate to apply the death penalty to those who carried out abortions.

The conservative revolution that Reagan helped usher in gained traction because Reagan's central insight - that the liberal welfare state had grown complacent and overly bureaucratic, with Democratic policy makers more obsessed with slicing the economic pie than with growing the pie - contained a good deal of truth.

When you've got little kids, and you're tucking them in. When you open a door and they're in their pajamas and they're, you know, wrestling with you and asking you, you know, to read to them and stuff, [The white House] starts feeling like home pretty quick. Not to mention having a mother-in-law upstairs, and the dog, and now two.