The path towards sustainable energy sources will be long and sometimes difficult. But America cannot resist this transition, we must lead it.

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

Cutting benefits is not the right answer. Raising the retirement age is not the best option.

It was basic research in the photoelectric field-in the photoelectric effect that would one day lead to solar panels. It was basic research in physics that would eventually produce the CAT scan. The calculations of today's GPS satellites are based on the equations that Einstein put to paper more than a century ago.

We have to enforce the laws we've already got, make sure that we're keeping guns out of the hands of criminals, those who are mentally ill. I also share your belief that weapons that were designed for soldiers in war theaters don't belong on our streets. And so what I'm trying to do is to get a broader conversation about how do we reduce the violence generally.

I believe in American exceptionalism, just as I suspect that the Brits believe in British exceptionalism and the Greeks believe in Greek exceptionalism.

We are engaging in the diplomatic efforts that are required within Iraq among the Shia, the Sunni and the Kurd, among friends, like Egypt, and Turkey and Saudi Arabia, but also enemies like Iran and Syria. They have to have buy-in into that process.