The greatest threat facing humanity is a radical Islamist regime meeting up with nuclear weapons.

The Iranian acquisition of nuclear weapons would be infinitely more costly than any scenario you can imagine to stop it.

We are categorically against proliferation of nuclear weapons.

I really believe the nexus of terrorism and nuclear weapons is the world's most ominous threat.

I can tell you one thing, Iran is closer to developing nuclear weapons today than it was a week ago, or a month ago or a year ago. It's just moving on with its efforts.

Today, India is a nuclear weapons state.