An Iraqi defector has given Pentagon officials a detailed inside look at Iraqi strongman Saddam Hussein's biological and chemical weapons programs — and told of buying nuclear materials with a briefcase full of $100 bills. The defector, whose story is recounted in the new edition of Vanity Fair magazine, says he was involved in the most sensitive of Iraq's secret arms programs before fleeing a year and a half ago. Presented to U.S. officials by the Iraqi National Congress, a London-based exile group pushing for an American attack on Iraq, the defector says Saddam is close to finishing a...