What we have done is when the threat has been directed at the United States, i.e., the terrorist threat from ISIL or Al-Qaeda in Syria, is to go after them.

If you're trying to get something done, there will always be people who don't want to see you get something done, or who have a stake in the status quo. And if they approach that through ad hominem criticism of you, you've got to have enough confidence and thickness of skin to be able to endure.

There was a hateful video that was disseminated on the Internet. It had nothing to do with the United States government, and it's one that we find disgusting and reprehensible. It's been offensive to many, many people around the world. That sparked violence in various parts of the world, including violence directed against Western facilities including our embassies and consulates.

We know that weapons, heavy weapons continue to flow across the border from Russia into Ukraine. And we have now, in recent days, indications that Russians - Russian military units themselves have, on occasion, fired into Ukraine.

I think it's very, very important that in foreign policy and national security decision making, as in any other realm, that there be a range of diversity that reflects the full complexity of America. We should draw on those experiences to inform our decision making.

I think most Americans understand that we went through a period in which American leadership was judged quite critically internationally.

You can't sit on the sidelines and read your iPhone and be on social media and expect everything to be cool. You have to be part of this.