The central issue in United States policy toward Iraq is the threat of weapons of mass destruction and what the international community should do to defuse that threat. The Iraqi dictator, Saddam Hussein, has spent almost two decades acquiring these inherently offensive weapons and their delivery systems. "The greatest threat to life on earth is weapons of mass destruction -- nuclear, chemical, biological," writes Richard Butler, former chairman of the United Nations Special Commission, which was charged with inspecting Iraq regularly for weapons violations. In his 2000 book, "The Greatest Threat: Iraq, Weapons of Mass Destruction, and the Crisis of Global Security," Butler argues the U.N. must act to eliminate Iraq's weapons of mass destruction.