The Scalia seat is defense. We're not going to get any better than Justice Scalia. The best we can do is preserve constitutional victories like upholding the Second Amendment, like protecting religious liberty. But we're not going to get any better.

We need to use overwhelming air power. We need to be arming the Kurds. We need to be fighting and killing ISIS where they are.

I think data is incredibly powerful for understanding what people are thinking and for allocating resources.

Nidal Hasan communicated with Anwar al-Awlaki, a known radical cleric, asked about waging jihad against his fellow soldiers. The problem is because of political correctness, the [Barack] Obama administration, like a lot of folks here, want to search everyone's cell phones and e-mails and not focus on the bad guys. And political correctness is killing people.

I don't think we should be engaged in nation-building. It's not our job to turn foreign nations into democratic utopias, to try to turn Iraq into Switzerland. It is the military's job to hunt down and kill our enemies, to kill ISIS before they murder American citizens and they wage jihad.

But we don't have a right to force anyone to abandon their faith. It is one of the foundational commitments of who we are as Americans to respect diversity.

Popularity isn't the end-all, be-all. What matters far more is that you stick to your principles, that you stand up and you live a life of integrity.