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There is nothing worth having that can be obtained by nuclear war - nothing material or ideological - no tradition that it can defend. It is utterly self-defeating.

None of us are nuclear experts, but we know that if there is a melt-down and breach of containment, that's clearly the most odious thing that could happen.

It used to be you needed to have a very large sophisticated state before you could even have a nuclear weapon... Now the technology is widespread enough. It doesn't take very many people to be able to cobble together a devastating attack, and all it takes is one.

There are some people that will be deterred by the fact that we have nuclear weapons... But those people are the folks we can deal with anyway.

Nuclear weapons continue to occupy a unique place in global security affairs. No other weapons, in my opinion, anyway, match their potential for prompt and long-term damage and their strategic impact.

We have got thousands of nuclear weapons in order to achieve deterrence.

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.

We've gotten a long way on missile defense. We know how to do it. We know how to take down incoming warheads, but we need to do a lot more work in order to be - to deploy a system that'll defend the United States against those kinds of limited strikes that might be possible by a nuclear armed North Korea or Iran.

It's a near miracle that nuclear war has so far been avoided.

Nuclear weapons are infinitely less important in our foreign policy than they were in the days of the Cold War. I don't think we need nuclear weapons any longer.