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Our nuclear weapons are meant purely as a deterrent against nuclear adventure by an adversary.

The nexus between terrorism and nuclear weapons, or even nuclear material, is obviously a current concern.

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.

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

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.

Proliferation of nuclear weapons to terrorist organisations is far more dangerous than proliferation of nuclear weapons to states, even states like North Korea.

We are not afraid of nuclear weapons. The point is that if we had in fact wanted to build a nuclear bomb, we are brave enough to say that we want it. But we never do that.

We must fight terrorism as if there's no peace process and work to achieve peace as if there's no terror.

The risk of just one terrorist with just one nuclear weapon is a risk we simply cannot afford to take.

Despite fearful rhetoric to the contrary, terrorism is not a transcendent threat. A terrorist attack cannot possibly destroy our country's way of life; it's only our reaction to that attack that can do that kind of damage.