Iraqi officials are still counting votes from Saturday's referendum, with partial results suggesting the draft constitution will be approved.
Officials say initial results show the draft passed in two key Sunni Arab dominated provinces, Diyala and Nineva, where it was expected to be rejected. The constitution would be rejected if two-thirds of voters in any three of Iraqi provinces voted against it.
President Bush praised Iraqis for voting despite threats of insurgent attacks. Officials put voter turnout at above 60 percent.
Meanwhile, a U.S. airstrike killed 20 people the military says were planting roadside bombs near Ramadi. The U.S. military says other coalition operations in al-Anbar province on Sunday killed 50 more suspected terrorists. But residents say at least half of the dead were civilians.
Some information for this report provided by AP and Reuters.