The United States can't impose democracies. We can't impose our will. The Russians found that out in Afghanistan.

My overall worldview has never changed: that America has and must maintain the strongest military in the world, that we must lead the international community to confront threats and challenges together, and that we must use all tools of American power to protect our citizens and our interests.

And I want every one of you, every one of us, 100 senators to look in that camera, and you tell your people back home what you think. Don't hide anymore; none of us. That is the essence of our responsibility. And if we're not willing to do it, we're not worthy to be seated right here. We fail our country. If we don't debate this, if we don't debate this, we are not worthy of our country. We fail our country.

Assad must go. He's lost the legitimacy to govern.

This current government in Iraq has never fulfilled the commitments it made to form a unity government with the Kurds, the Sunnis and the Shia. We have worked hard with them within the confines of our ability to do that but we can't dictate to them.

There's always a balance, I think, any administration has to find in not just the military but in any agency of government.

It is easy to get into war, not so easy to get out.