In the spring of 2002 Dick Cheney made one of his periodic trips to CIA headquarters. Officers and analysts were summoned to brief him on Iraq. Paramilitary specialists updated the Vice President on an extensive covert action program in motion that was designed to pave the way to a US invasion. Cheney questioned analysts about Saddam Hussein's weapons of mass destruction. How could they be used against US troops? Which Iraqi units had chemical and biological weapons? He was not seeking information on whether Saddam posed a threat because he possessed such weapons. His queries, according to a CIA officer...