I do believe that Russia did and will continue to try and manipulate Americans' perspective on a whole variety of issues.

We need to fund our troops. We need to protect them. We need to increase homeland security. These are vital national security interest we need to fund.

People think of border security in very different ways, but to me, it's very simple: border security is national security.

I worked at the crossroads of policy and operations. I kind of bring all that experience together because homeland security is a team sport, and I've played almost every role, every player, every team.

And I think most people in this country want to see a president that's got the courage to say we're going to cut the tax burden, and reduce the regulatory climate, and we're going to get Americans working.

Something happened during the 1980s - perhaps the political climate of that time - that caused me to ask how a people would become part of a system that oppresses their own people.

The forces that are in play on climate change essentially revolve around the generation of power, the transportation of goods and services and people, and the sorts of materials that we use to fuel the whole of our civilisation.

My father's generation's crisis was fighting fascism. Ours is fighting climate change. It is much harder because you can't see it, it is not an obvious threat. But the solution is in our hands.