I think we are making an assumption that that is the outcome of the negotiations. I think President Assad will be prepared to accept whatever the outcome of the intra-Syrian dialogue and the decision of the Syrian people is. But people are trying to decide and determine the outcome of the negotiation before even we agree to start the negotiations.

I think the most important challenge that remains is this mentality in Washington that sanctions have been an asset, and some people want to find even an excuse to keep them or an excuse to reintroduce them. I don't know whether they've looked at the record of how sanctions actually produce exactly the opposite of what they wanted to produce.

You know where the people who killed people in San Bernardino came from. You know where people who did 9/11 came from. You know where the people who did Paris came from, where they transited, where they went. None of them even set foot in Iran. So why are you punishing people who are visiting Iran for that? . . . We're not going to radicalize them. We never have. Your allies have radicalized people who visited.

Understanding that these statements do not represent reality, we should not be threatened by the language that he has used.

We call upon the nuclear-weapon states to immediately cease their plans to further invest in modernizing and extending the life span of their nuclear weapons and related facilities.

I think we are making an assumption that that is the outcome of the negotiations. I think President Assad will be prepared to accept whatever the outcome of the intra-Syrian dialogue and the decision of the Syrian people is. But people are trying to decide and determine the outcome of the negotiation before even we agree to start the negotiations.

If anything caused ISIS, it was the 2003 U.S. invasion of Iraq.