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GOP presidential front-runner Donald TrumpDonald TrumpChinese apps could face subpoenas, bans under Biden executive order: report Kim says North Korea needs to be 'prepared' for 'confrontation' with US Ex-Colorado GOP chair accused of stealing more than 0K from pro-Trump PAC MORE is the “Michael Moore candidate of the Republican Party,” Sen. Lindsey GrahamLindsey Olin GrahamOVERNIGHT ENERGY:  EPA announces new clean air advisors after firing Trump appointees |  Senate confirms Biden pick for No. 2 role at Interior | Watchdog: Bureau of Land Management saw messaging failures, understaffing during pandemic Graham, Whitehouse: Global transition to renewables would help national security Hillicon Valley: Senate unanimously confirms Chris Inglis as first White House cyber czar | Scrutiny mounts on Microsoft's surveillance technology | Senators unveil bill to crack down on cyber criminals 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.