Graham calls Trump the GOP's 'Michael Moore candidate'

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GOP presidential front-runner Donald TrumpDonald TrumpObama reads mean tweet from Trump on ‘Kimmel’ 5 takeaways from the Pa. Senate debate Report: Clinton ordered operative to troll Trump with duck MORE is the “Michael Moore candidate of the Republican Party,” Sen. Lindsey GrahamLindsey GrahamThe Trail 2016: Who is really winning? Graham: GOP Senate could rein in Clinton White House The Hill's 12:30 Report MORE (R-S.C.) said in an interview early Monday.

“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.