I do think that it's really important for leaders of countries to be very clear and careful in the statements they make because their words are weighed extremely carefully by other countries, and you have to create a continuity of seriousness and of credibility in order to be able to be taken seriously and get things done.

I saw courage both in the Vietnam War and in the struggle to stop it. I learned that patriotism includes protest, not just military service.

Those localized efforts take a long time and they don't deal with the larger issue of ISIL and the question of what you're going to do to really have a solution here. We have to save Syria.

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.

The threat of Saddam Hussein with weapons of mass destruction is real, but as I said, it is not new. It has been with us since the end of that war, and particularly in the last 4 years we know after Operation Desert Fox failed to force him to reaccept them, that he has continued to build those weapons. He has had a free hand for 4 years to reconstitute these weapons, allowing the world, during the interval, to lose the focus we had on weapons of mass destruction and the issue of proliferation.

If [Bashar] Assad himself could save this whole process by saying, "I will engage in a managed transition where we all work together to stabilize the government, save the institutions of government, and turn on ISIL and preserve Syria." That could happen. It all depends on one man, and Russia and Iran should not be so stubborn here that they tie this whole thing up simply because of one person.

I will never conduct a war or start a war because we want to; the United States of America should only go to war because we have to. And if you live by that guidance, you'll never have veterans throwing away their medals or standing up in protest.