In this Sept. 9, 2015 file photo, Republican presidential candidate Donald Trump speaks on Capitol Hill in Washington. (AP Photo/Carolyn Kaster)

The Club for Growth, a conservative group that has routinely criticized Donald Trump, plans to unveil a "major television ad campaign in an early presidential primary state" on Tuesday on the heels of asking top Republican donors to give the organization money to fund a multimillion-dollar campaign against the Republican front-runner.

A public relations representative for the anti-tax group sent out a news release Monday morning announcing its super PAC arm, Club for Growth Action, would debut the ad on Tuesday morning at the National Press Club in Washington. Asked what the ad is about, Club for Growth spokesman Doug Sachtleben declined to comment.

But as The Washington Post reported earlier this month, the group, which has feuded with Trump throughout the summer, began asking top Republican donors in recent weeks to give them money to fund an attack ad campaign against Trump. But some GOP financiers were skeptical of the plan, fearing it would only fuel Trump’s outsider appeal if a D.C.-based group financed a major effort to criticize him.

“What we’ve said to our members is that ‘Trump is a liability to the future of the nation,’ and we’ve asked them for support for Club for Growth Action to get that message out,” Club for Growth President David McIntosh said in a statement to The Washington Post earlier this month.

Trump and the Club for Growth have been engaged in a nasty back-and-forth for months. In an interview with The Post earlier this month, Trump bashed the Club for Growth for its decision to weigh attacking him and pointed out, as he has previously, that McIntosh asked him in June to donate $1 million to the group.

“They’re critical of me because I wouldn’t give them a million dollars,” Trump said in the interview with The Post. “They came to my office, the president of the Club for Growth came to my office; he asked for a million dollars. He asked for it in writing, just to show you how truly stupid he is. I said, ‘You must be kidding.’ I had no interest in doing it. . . . We told them no, and immediately thereafter, he came after Trump.”

Club for Growth officials say Trump's team requested the meeting.

The Club for Growth has a record of going after Republicans it deems insufficiently conservative. It launched an attack ad against Mike Huckabee earlier this year.

The group has also meddled in Democratic primaries, famously taking on liberal candidate Howard Dean in a 2004 ad that labeled him a "tax-hiking, government-expanding, latte-drinking, sushi-eating, Volvo-driving, New York Times-reading" contender.