In an interview with the Public Broadcasting Service's Newshour with Jim Lehrer, Mr. Bush said he was disappointed and felt the Iraqis fumbled the execution.
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He says Saddam was given a trial and justice, but that when it came to the execution, it looked like a revenge killing.
Footage of Saddam's final moments were recorded in an illicit video and posted on the Internet. The video shows officials taunting Saddam on the gallows.
The interview is Mr. Bush's latest since announcing his new strategy for Iraq last week.
Some information for this report was provided by AP and Reuters.