If we don't go far enough fast enough, the damage we inflict could take centuries to undo - if it can be undone at all.

I think the world is safer without Iran with a nuclear weapon. The world has got the potential to be safer if we fully implement the Paris agreement.

We have to recognize that there is a strong, fresh wind blowing, powered by these new information technologies. It will be increasingly difficult for dictators to impose their will through sheer brutality.

Unlike George Bush and his friends at the big oil companies, I'm going to work for a real energy policy for this country that decreases America's dependence on foreign oil and helps lower the costs to American families.

America has an ability to try to make some things happen that other countries don't necessarily have.

Those who doubted whether Iraq or the world would be better off without Saddam Hussein, and those who believe today that we are not safer with his capture, don't have the judgment to be President.

I know something about aircraft carriers for real.