A super PAC supporting Ben Carson's presidential campaign has accused three GOP presidential candidates — Jeb Bush, Chris Christie and John Kasich — of trying to buy the nomination.

The allegation comes in a fundraising pitch from 2016 Committee Chairman John Philip Sousa IV that asked for a "symbolic monthly contribution" of $20.16 to become a "Campaign Patriot." The super PAC took direct aim at Bush's fundraising stockpile and the gap between Carson and "the establishment."

"Bush, Christie and Kasich are dumping millions of dollars into TV ads doing their best to buy the Republican presidential nomination," wrote Sousa in the email to potential donors. "Jeb Bush alone has already stockpiled more than $110 million dollars and he's only getting started. The best way for us to catch him is by recruiting new monthly supporters."

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The Bush, Christie and Kasich campaigns did not immediately respond to requests for comment on the 2016 Committee's accusation.

The super PAC's attack on the governors' campaigns comes as Ben Carson has reportedly scheduled no public events for two weeks to focus on his book tour and other fundraising events. Carson's campaign raised $20 million during the three-month period ending Sept. 30. The campaigns must submit their third quarter reports to the FEC before Thursday ends, though the super PAC supporting Carson looks to already have its eye on the fourth quarter.

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