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GOP presidential front-runner Donald TrumpDonald John TrumpAssange meets U.S. congressman, vows to prove Russia did not leak him documents A history lesson on the Confederacy for President Trump GOP senator: Trump hasn't 'changed much' since campaign MORE is the “Michael Moore candidate of the Republican Party,” Sen. Lindsey GrahamLindsey GrahamGraham: Trump's Charlottesville rhetoric 'dividing Americans, not healing them' OPINION: Congress should censure Trump for his unfit conduct Supporting 'Dreamers' is our civic and moral duty 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.