GOP frontrunner Donald Trump sent the Club for Growth a “cease and desist letter” alleging the organization published false and defamatory information about him through its advertisements that say Trump supports the “highest tax increase in history.”

“The misleading ad fails to disclose the details of Mr. Trump’s proposal (‘impose a onetime net worth tax of 14.25% on the super wealthy … to pay off the national debt.’) a concept he suggested over fifteen years ago and has not supported since. This is the very definition of libel,” read Trump’s campaign press release.

Trump stated in the press release:

I am not surprised the dishonest, irrelevant and totally failing Club for Growth has resorted to attacking the definitive front runner, especially after I refused to contribute to their pathetic group. We will be releasing my current tax proposal, which is a major decrease in taxes, in the next week and will continue to expose the two faced hypocrisy of the Club for Growth and the problems groups like this perpetuate within a broken Washington, D.C.

The press release also alleges the Club for Growth “openly and shamelessly attempted to extort Mr. Trump to the tune of $1 million in exchange for political support.”

This is a claim Trump has made against the Club for Growth since the organization first began attacking him, and the two parties have gone back and forth on this issue, which Breitbart News previously noted.

Over the weekend at the California GOP Convention, fellow GOP presidential candidate former Arkansas Gov. Mike Huckabee also blasted the Club for Growth, saying the organization has no “credibility” after praising Democrat Rep. Alan Grayson.

UPDATE:

“Tough guy Donald Trump starts whining when his liberal record is revealed,” responded Club for Growth president David McIntosh.

He added:

Trump has advocated higher taxes numerous times over many years, just like he’s advocated for universal health care, the Wall Street bailout, and expanded government powers to take private property. Trump’s own statements prove that our ads are accurate. They will continue to run.  We suggest that Donald grow up, stop whining, and try to defend his liberal record.