Republican presidential front-runner Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE on Monday again hinted at a possible third-party run, saying that the Republican National Committee (RNC) is "in default" of an agreement and is not treating him fairly.

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"When somebody's in default, that means the other side can do what they have to do," he said. "The RNC is in default."

Trump signed a pledge last year to run as a Republican and not as an independent. He first raised the posibility of a third-party run in an exclusive interview with The Hill last summer.

“I signed a pledge, but it’s a double-edged pledge, and as far as I’m concerned they’re in default of the pledge,” he said at a campaign event outside of Charleston, S.C., The Guardian reported.

During a later press conference, Trump said he was disappointed with the RNC because it stacks the room at debates "with special interests and donors."

"The RNC gave all the tickets to special interests that represented Cruz and Rubio. They had all the tickets," he said. "They walked on the stage and the place went crazy."

He said he doesn't have donors or special interests.

"I think the RNC did a very poor job," he said. "We've warned them ... and they don't listen."

The RNC has "total control" over Trump's competitors, he added.

"The bottom line is the RNC is controlled by the establishment and the RNC is controlled by the special interests and the donors and that's too bad," he said.