The Iraq war was not necessary. Waging an unnecessary war is a grave mistake. . . . When words I uttered, believing them to be true, were exposed as false, I was constrained by my duties and loyalty to the president and unable to comment. But I promised reporters and the public that I would someday tell the whole story of what I knew.

- Former White House press secretary Scott McClellan, author of the new book "What Happened: Inside the Bush White House and Washington's Culture of Deception"