The decision to send British troops to join the US invasion of Iraq was by far the most controversial of Tony Blair's leadership, and his place in history may depend on how well he defends it today. The former prime minister will face 6 hours of grilling from inquisitors about when he committed Britain to the war, whether or not he manipulated intelligence on weapons of mass destruction, and if he strong-armed his attorney general into declaring the war legal.
Blair's testimony will be the climax of the inquiry, which began late last year. Large numbers of anti-war demonstrators, including family members of some of the 179 British troops killed in Iraq, plan to demonstrate outside. Blair—who wrote that he believed "beyond doubt" that Saddam Hussein had weapons of mass destruction in a foreword to a 2002 intelligence dossier used to justify the war—is expected to argue that he still believes he made the right decision, the BBC reports. (More weapons of mass destruction stories.)