Illinois Gov. J.B. Pritzker (D), his wife and his brother-in-law are the subject of a federal probe relating to a property tax appeal for one of their residential properties, according to WBEZ.

The investigation reportedly stems from Pritzker and his wife M.K. Pritzker’s pursuit of a property tax break for a mansion they purchased next to their home on Chicago’s Gold Coast.

M.K. Pritzker reportedly directed workers to remove all toilets from the mansion, making the Pritzkers eligible for a property tax break since the building was “uninhabitable,” according to a Cook County inspector general’s report first reported by the Chicago Sun-Times in October 2018, before Pritzker was elected.

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Three days after the Sun-Times published the story, J.B. Pritzker’s brother-in-law Thomas J. Muenster wrote five checks totaling more than $331,000 on the Pritzkers’ behalf and sent them to Cook County Treasurer Maria Pappas, writing that the checks were “in no way an admission of any wrongdoing,” according to WBEZ.

M.K. Pritzker’s personal assistant Christine Lovely, who reportedly was involved in the property tax appeal, has retained attorney Reid Schar, a former federal prosecutor who helped prosecute former Illinois Gov. Rod Blagojevich (D) on corruption charges, according to WBEZ.

“Neither the Governor nor the First Lady have been contacted by law enforcement regarding the property tax appeal,” Pritzker attorney Marc Elias, a partner with the Perkins Coie law firm, which has done extensive legal work on behalf of Pritzker’s gubernatorial campaign, told the news outlet. “We are confident that any further review of the matter will show that the appropriate rules were followed.”

Pritzker’s office did not immediately respond to a request for comment.