And if [Vladimir Putin] does fight ISIL alone, how does it work out for Russia to have sided with Assad, sided with Iran, sided with Hizballah, when they're trying to reach out to the rest of the Sunni world in the region? That's not a good equation for Russia.

Climate change is real. The science is compelling. And the longer we wait, the harder the problem will be to solve.

I defended this country as a young man, and I will defend it as president.

Republican secretaries of state from Kissinger to Baker, Powell to Rice, President Bush, 71 United States Senators all supported President Obama's new START treaty, but not Mitt Romney.

I know something about aircraft carriers for real.

We should not allow a tiny minority of shoddy scientists and science and extreme ideologues to compete with scientific facts.

Unlike Washington, which is stuck in ideological gridlock, Americans feel the impact of climate change in their own hometowns and they know something must be done.