It wasn’t the best choice. I made a mistake. It was not prohibited. It was not in any way disallowed. And as I have said and as now has come out, my predecessors did the same thing and many other people in the government. But here’s the cut to the chase facts. I did not send or receive any emails marked classified at the time. What you are talking about is retroactive classification. And the reason that happens is when somebody asks or when you are asked to make information public, I asked all my emails to be made public. Then all the rest of the government gets to weigh in. ... I think that what we have got here is a case of overclassification. ...

When I became secretary of state, Iran was weeks away from having enough nuclear material to form a bomb. They had mastered the nuclear fuel cycle under the Bush administration. They had built covert facilities. They had stocked them with centrifuges that were whirling away. And we had sanctioned them. I voted for every sanction against Iran when I was in the Senate, but it wasn't enough. So I spent a year-and-a-half putting together a coalition that included Russia and China to impose the toughest sanctions on Iran.

There are common-sense things that your government could do that would give Americans more opportunities to succeed. Why don’t we do it? Because powerful special interests and the tendency to put ideology ahead of political progress have led to gridlock in Congress.

Stemming this tide will require much better coordination and information sharing among countries every step of the way. We should not stop pressing until Turkey, where most foreign fighters cross into Syria, finally locks down its border. The United States and our allies need to know and share the identities of every fighter who has traveled to Syria.

We finally need to pass a prohibition on anyone who's on the terrorist watch list from being able to buy a gun in our country. If you're too dangerous to fly, you are too dangerous to buy a gun. So there are things we can do, and we ought to do it in a bipartisan way.

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I believe strongly that commonsense gun safety measures would assist us. Right now -- and this is something Donald has supported, along with the gun lobby -- right now, we've got too many military- style weapons on the streets. In a lot of places, our police are outgunned. We need comprehensive background checks, and we need to keep guns out of the hands of those who will do harm.

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I guess Senator Sanders, that the Koch brothers, as you said, are sensible with how they use their money. And I agree with you. They stand for things that I find abhorrent, that would be bad for our country, bad for our future. But they did just put up a little video praising you for being the only Democrat who stood with the Republicans to try to eliminate the Export/Import Bank, which has helped hundreds and hundreds of companies here in Florida be able to export their goods and employ more Floridians. So from my perspective, you sided with the Koch brothers.