Motivated by the tragedy of September 11, the U.S. has recently announced a historic policy change. The Bush Doctrine proclaims that the U.S. will pre-emptively and — if necessary — unilaterally attack with overpowering force any nation posing a threat to it. Since the fall of 2002 the U.S. has been making the case that Saddam Hussein’s Iraq poses just such a threat. The CBC’s Brian Stewart takes a look at the genesis of this policy and the risks associated with it. In a separate update, News in Review examines the United Nations’ efforts to confirm whether or not Iraq possesses weapons of mass destruction, and the reaction of Americans and America’s allies to the possibility of war.