Republican National Committee Chairman Reince Priebus on Monday took a shot at Democratic presidential front-runner Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE's tax plan, asking her accountant if she is putting "her money where her mouth is" and paying additional taxes.

“As Hillary and Bill Clinton William (Bill) Jefferson ClintonBarr says Ginsburg 'leaves a towering legacy' Trump reacts to Ginsburg's death: 'An amazing woman who led an amazing life' Jimmy Carter remembers Ruth Bader Ginsburg as 'a beacon of justice' MORE’s financial and estate planner, as well as their personal accountant, I am writing to you on this annual tax day to inquire as to whether Hillary Clinton has chosen to put her money where her mouth is and pay the additional taxes she is hypocritically proposing that other Americans of similar income pay, but not said she is willing to voluntarily pay herself,” he wrote in a letter to Rorrie Gregorio, national partner-in-charge at the Family Office Group.

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“As a part of Mrs. Clinton’s tax policy proposals, she has called for an unprecedented new tax on Americans who earn more than $5 million annually,” he added. "This 4-percent ‘surcharge’ would effectively create an entirely new tax bracket for people at the top 0.01 percent, such as herself.

“With the Clintons’ tremendous income, I am calling upon them to fully embrace her new tax by applying the ‘surcharge’ to her family’s previous income since 2001 when her family income has been in excess of $10 million on average annually.”

Priebus also calculated how much money Clinton would owe in back taxes under her own proposal.

“As a member of the top .01 percent of American income-earners and a proponent of higher taxes, Clinton should practice what she preaches by sending the U.S. Treasury the over $4.6 million she would have owed under her new tax,” he said.

“In addition, it is imperative that the Clintons continue to lead moving forward, and pay this 4-percent ‘surcharge’ tax on their 2015 federal income tax filings and each year moving forward,” Priebus added.

“The American people are tired of the Clintons playing by their own set of rules. I urge Hillary Clinton to put aside her family’s tax hypocrisy, put her money where her mouth is and pay the IRS the costs of her own tax hiking agenda."