Washington, D.C. ? Federal auditors have concluded the Rev. Al Sharpton’s 2004 campaign owes the government nearly $500,000 for illegal donations and other financial improprieties.

Sharpton has been feuding with the Federal Election Commission for years over his accounting in his failed run for president, for which he received $100,000 in so-called government matching funds that authorities later concluded he did not deserve because he hadn’t followed campaign laws.

The auditors have now determined that Sharpton owes $486,803 to the U.S. Treasury because of his campaign’s taking improper donations, largely from the National Action Network, a not-for-profit corporation that Sharpton leads but is separate from his campaign committee.

Sharpton will appeal the finding, aides said Friday, which would extend an already years-long fight with the government over how he raised and spent money to run for president.