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GOP presidential front-runner Donald TrumpDonald TrumpScarborough defends CNN against Trump: CNN 'has more integrity' Time asks Trump Organization to remove fake cover from golf clubs Why UK millennials voting for socialism could happen here, too MORE is the “Michael Moore candidate of the Republican Party,” Sen. Lindsey GrahamLindsey GrahamOvernight Cybersecurity: New ransomware attack spreads globally | US pharma giant hit | House intel panel interviews Podesta | US, Kenya deepen cyber partnership Graham gets frustrated in public ‘unmasking’ debate GOP senator: Don't expect Trump to 'have your back' on healthcare vote 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.