Today, more than ever before, science holds the key to our survival as a planet and our security and prosperity as a nation. It's time we once again put science at the top of our agenda and work to restore America's place as the world leader in science and technology.

But while they're adding teachers in places like South Korea, we're laying them off in droves. It's unfair to our kids. It undermines their future and ours. And it has to stop. Pass this bill, and put our teachers back in the classroom where they belong.

I can think about what [Mahatma] Gandhi said or [Martin Luther] King said about violence begetting violence, and still be true to my job by asking myself the question whenever we're confronted with a situation where some may be arguing for military action: Will this actually result in America being safer, or the most lives being saved?

Every president who has tried to bring about big changes I think elicits the most passionate responses.

Rand`s [Paul] a libertarian. He has a view of the world that I don`t share. He said that we shouldn`t have any troops in Iraq. He agreed with Obama that was a disaster. When there was a chance to do something constructive about Syria with a no-fly zone, he said we don`t need one.

ISIS is not an organization that can destroy the United States. This is not a huge industrial power that can pose great risks to us, institutionally or in a systematic way. But they can hurt us. And they can hurt our people and our families.

We will continue to deepen our engagement using every element of American power - diplomacy, military, economic development, the power of our values and our ideals.