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My red line is Iran may not have a nuclear weapon. It is inappropriate for them to have the capacity to terrorize the world. Iran with a nuclear weapon or with fissile material that can be given to Hezbollah or Hamas or others has the potential of not just destabilizing the Middle East.

We must not let ourselves be swept off our feet in horror at the danger of nuclear power. Nuclear power is not infinitely dangerous. It's just dangerous, much as coal mines, petrol repositories, fossil-fuel burning and wind turbines are dangerous.

Iran's continued pursuit of nuclear weapons, support for international terrorist organizations, and abhorrent human rights practices pose one of the greatest threats to global security.

My greatest fear is the Iranians acquire a nuclear weapon and give it to a terrorist organization. And there is a real threat of them doing that.

Nuclear proliferation - the proliferation of WMDs altogether - is one of the greatest dangers of our time.

The message from national security experts and citizens around the world is clear: The only way to eliminate the global nuclear danger is to eliminate all nuclear weapons.

I've repeatedly voted for sanctions against Iran. And I think all options should be on the table to prevent them from having nuclear weapons.

We must make every effort to neutralize this threat peacefully, but be ever mindful of the growing danger Iran poses not just to a safe and free America, but to our allies abroad.

A nuclear-weapons armed Iran is not in anyone's human-rights interests. That is a direct threat to the lives and the livelihoods and the stability not only of the region but beyond.

Iran is not about building nuclear weapons. We don't wanna build nuclear weapons. We don't believe that nuclear weapons bring security to anybody, certainly not to us.