That is what Americans do. We face a challenge - no matter how great - because we know that on the other side there is always hope.

We do have to take the long-term view. And long term, the question to ask ourselves is whether America should attack others pre-emptively, whether she should embroil herself in wars far away from our soil, and try to bring democracy by force to the rest of the world.

Let me just say you could end this violence within a very short period of time, have a complete ceasefire - which Iran could control, which Russia could control, which Syria could control, and which we and our coalition friends could control - if one man would merely make it known to the world that he doesn't have to be part of the long-term future; he'll help manage Syria out of this mess and then go off into the sunset, as most people do after a period of public life. If he were to do that, then you could stop the violence and quickly move to management.

What remains unchanged is the principle, which is that we do not launch wars without overwelming reasons, and overwhelming alliances, and without overwhelming force.

I had a chance to talk with President [Vladimir] Putin and he clearly said to me very directly, "I will think about that. I will think about this challenge of how we win." Look, this is not easy for Putin. Everybody says, "Oh, Putin's made a big move." Well, Putin is [in Syria] now; and if he wants to fight ISIL alone, that's a challenge, folks.

When I was in Vietnam I learned a lot about the promises that soldiers make to each other. The Marines have a promise to never leave behind their dead. In this country, as citizen soldiers, we need to make the commitment to each other that we will never leave our veterans behind.

I don't believe we need a good conservative judge, and I don't believe we need a good liberal judge. I subscribe to the Justice Potter Stewart standard. He was a justice on the Supreme Court of the United States. And he said the mark of a good judge, good justice, is that when you're reading their decision, their opinion, you can't tell if it's written by a man or woman, a liberal or a conservative, a Muslim, a Jew or a Christian. You just know you're reading a good judicial decision.