A Miami-based billionaire is suing the Internal Revenue Service over the leak of his confidential tax information to ProPublica, a nonprofit news outlet who used that information to report on tax payments by some of the country’s wealthiest individuals.

“By enacting [federal privacy and IRS negligence laws] Congress unequivocally declared its intent to safeguard the confidentiality of U.S. taxpayers Tax return information, including Mr. Griffin’s, and to hold the IRS to account for failing to adequately do so,” reads the complaint filed by Citadel owner and hedge fund manager Kenneth Griffin in the Southern District of Florida Tuesday morning.