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GOP presidential front-runner Donald TrumpDonald John TrumpIvanka Trump pens op-ed on kindergartners learning tech Bharara, Yates tamp down expectations Mueller will bring criminal charges Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open MORE is the “Michael Moore candidate of the Republican Party,” Sen. Lindsey GrahamLindsey Olin GrahamDurbin: I had 'nothing to do' with Curbelo snub Republicans jockey for position on immigration Overnight Health Care: House passes 20-week abortion ban | GOP gives ground over ObamaCare fix | Price exit sets off speculation over replacement MORE (R-S.C.) said in an interview early Monday.

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“What he said about President George W. Bush being a liar and that the Bush administration is the cause of 9/11 is Michael Moore stuff,” Graham told ABC's "Good Morning America."

Trump said Saturday during the Republican presidential debate that President Bush “lied” to the American people by suggesting there were weapons of mass destruction in Iraq, even though “they knew there were none."

The billionaire’s allegations angered fellow Republicans who have stood by the Bush administration.

Graham, who ended his own presidential bid in December and is backing Jeb Bush, shot back against Trump on Monday, comparing him to Michael Moore, the famous liberal film director.