(CNN) - Florida Republican Senate candidate Marco Rubio accused Gov. Charlie Crist's campaign Wednesday night of leaking his American Express credit card statements to the media, the latest sign the Sunshine State's GOP Senate primary is taking an increasingly divisive turn.
"It is clear these internal documents were taken from the [Republican Party of Florida] by former Chairman Jim Greer, or someone working for him, and were leaked to the media by the Crist Campaign," Rubio said Wednesday in a letter to current RPOF Chairman John Thrasher. "These actions are an appalling act of political desperation."
Greer, a longtime ally of Crist's, resigned his post in January amid criticisms over his management of party money and his involvement in contested primaries. Several of Rubio's backers had called for Greer's resignation for months.
The credit card records, obtained by the St. Petersburg Times/Miami Herald, indicate Rubio made several personal purchases with the state party's corporate credit card when he was Florida's House speaker between the years of 2005 to 2008.
A spokesman for Crist did not address Rubio's allegation that their campaign was behind the leaked documents, but said the credit card bills show "a clear pattern is emerging in Speaker Rubio's unfortunate behavior."
"The lobbyist-politician whines and plays the victim while continuing to make every effort to hide the facts surrounding his personal financial gain while in office," said Andrea Saul, Crist's communications director.
The expenses in question included repairs to his family car, items at an Apple Store, grocery bills, and purchases from a wine store close to Rubio's home. In his letter to the state GOP chairman Wednesday, Rubio contends GOP officials fully permitted him to put personal expenses on the card so long as he reimbursed the party for them.
Contending that he reimbursed the party for all his personal expenses, Rubio said he paid the party more than $16,000 for expenditures not related to party business.
"At no time during my four years as a cardholder did the party ask me to provide additional information about, or personally pay, any of the charges I submitted for payment," wrote Rubio. "I always took it upon myself to identify and directly pay American Express for all non-official expenses."
"To the greatest extent possible, I made sure the Party never paid for any personal charges," he added. "In fact, all of my statements were- at least I certainly hope they were- reviewed and approved by former Chairman Jim Greer or others designated by him."
Katie Gordon, a spokesman for the Florida GOP told the Times/Herald that the card is only meant to be used for "business expenses."
Rubio also maintained that he continually "erred on the side of caution," classifying an expenditure as "personal" whenever he was in doubt if the party should pay for it or not. According to Rubio, the party approved more than $109,000 in expenses directly related to his work for the organization.
UPDATE: In a fundraising e-mail to supporters Thursday, Rubio writes that "Charlie Crist and his campaign are incredibly desperate and may well have hit rock bottom."