It's one of the reasons [Vladimir Putin invitation to U.S] why 50 national security officials who served in Republican information - in administrations have said that Donald [Trump] is unfit to be the commander- in-chief. It's comments like that that really worry people who understand the threats that we face.

It is, from my perspective, less important today looking backwards as to why these militants decided they did it than to find them and bring them to justice, and then maybe we'll figure out what was going on in the meantime.

If they hear people running for - president... despite all the other problems that George W. Bush made after 9/11 when he basically said after going to a mosque in Washington, "We are not at war with Islam or Muslims. We are at war with violent extremism. We are at war with people who use their religion for purposes of power and oppression."

I do remember being young.

I think that the decision to go to war in Iraq was a mistake.

I want us to invest in your future. That means jobs in infrastructure, in advanced manufacturing, innovation and technology, clean, renewable energy, and small business, because most of the new jobs will come from small business.

Remember what Teddy Roosevelt did. Yes, he took on what he saw as the excesses in the economy, but he also stood against the excesses in politics. He didn't want to unleash a lot of nationalist, populistic reaction. He wanted to try to figure out how to get back into that balance that has served America so well over our entire nationhood.