This is an ongoing threat from a variety of sources around the world. And actually I think it works both ways. I'm not privy to it, but I think all of the various country that have the ability are invading each other's computers all the time. But we have to protect our data. It's very important.

I do believe people ought to be left alone. I don't care who you are or what you do at home or who your friends are or where you hang out, what kind of music you listen to, what you do in your home is your own business. That's always been who I am. I am a leave me alone kind of guy.

I think we've made the collection haystack so big, no one's ever getting through the haystack to find the needle. What we really need to do is isolate the haystack into a group of suspicious people and spend enormous resources looking at suspicious people, people who we have probable cause.

My goodness, what we want in a leader is someone with judgment, not someone who is so reckless as to stand on the stage and say, "Yes, I'm jumping up and down; I'm going to shoot down Russian planes." Russia already flies in that airspace. It may not be something we're in love with the fact that they're there, but they were invited by Iraq and by Syria to fly in that airspace.

Currently, the United States has troops in dozens of countries and is actively fighting in Iraq, Syria, Libya, and Yemen (with the occasional drone strike in Pakistan). In addition, the United States is pledged to defend 28 countries in NATO. It is unwise to expand the monetary and military obligations of the United States given the burden of our $20 trillion debt.

Are you so afraid that you are willing to trade your freedom for security?

I just can't vote to go to war unless I think there's a real clear-cut American purpose in the war, that we're going to win and that we're not going fight for stalemate.