Former US President George Bush, father of the current president, has attacked film-maker Michael Moore as a "slimeball" for Fahrenheit 9/11.
George Bush Sr dismissed Michael Moore's "lies about my family"
Moore's controversial documentary makes links between the Bush family and the Bin Laden and Saudi royal dynasties.
Speaking to WCSH-TV in Maine, US, the former president said Moore was a "total ass, slimeball". He added it was "outrageous, his lies about my family".
The film was a hit in the US, taking $119m (£66m) at box offices.
It alleges Saudis, including those with connections to the Bin Laden family, funded oil and arms companies run by the Bush family and their inner circle.
It claims those companies profited from the aftermath of 11 September.
Moore has made no secret of the fact he wants the current president removed from office, and timed the film's release to have the maximum impact on voters.
Meanwhile, the film-maker has promised to set up a scholarship at California State University, San Marcos, after the university cancelled his appearance because of his outspoken views. The university said he would be welcome back after next month's presidential election.
Moore addressed about 10,000 people on Tuesday outside the campus instead.
He said he would give $5,000 (£2,775) per year to the student who "stands up the most to the administration of Cal State San Marcos".
"I hope to encourage students in the future to do the
true American thing and stand up for what they believe
in," he said.