President Bush says the security crackdown in Baghdad is showing signs of progress, but success "will take months, not days or weeks."
Bush marked the fourth anniversary of the Iraq invasion with a plea for patience in a televised statement from the White House Roosevelt Room. He said "there will be good days and bad days ahead" as plans to control sectarian violence and insurgent activity unfold.
The war has stretched longer and cost more than the White House ever predicted. Democratic lawmakers have inserted a September 2008 deadline for troop withdrawal into a war spending bill currently moving through the House.
The president said imposing a deadline "may be satisfying in the short run," but predicted the consequences for the nation's security would be "devastating."