When we're talking about technology that involves weapons of mass destruction, nuclear, chemical or biological weapons, there has to be an element of preemption.

We have no such weapons at all, no chemical weapons, no biological weapons.

One letter to bin Laden reveals that al Qaeda was working on chemical and biological weapons in Iran.

Every day Saddam remains in power with chemical weapons, biological weapons, and the development of nuclear weapons is a day of danger for the United States.

The inspections started in 1991, right after the Gulf War. One of the conditions for the ceasefire was that Iraq had to do away with all of its weapons of mass destruction - biological, chemical and nuclear weapons and long-range missiles.

I'm not concerned about weapons of mass destruction.