The United States, and the president's made this clear, does not want Iran to develop a nuclear weapon. That's a red line for us. And it's a red line obviously for the Israelis so we share a common goal here.

As a nuclear power - as the only nuclear power to have used a nuclear weapon - the United States has a moral responsibility to act.

Our goal is simple: to stop Iran from obtaining a nuclear weapon.

The Russians and the Chinese have been absolutely clear they don't want to see Iran with a nuclear weapon.

Am I not correct in saying that Iran has never voiced that they are developing a nuclear weapon, nor do they have any intention of using a nuclear weapon against the United States? That's never actually been voiced. I don't know where that has come from, but it hasn't been from Iran.

What the United States has to do is send a clear message to Iran that they will not be able to develop nuclear weapons. Why endure the difficulty of sanctions if they are not going to be able to develop nuclear weapons anyway?