The Obama administration must acknowledge the existence of an independent investigation into former White House senior economics adviser Austan Goolsbee’s alleged unauthorized access to the Koch brother’s tax returns, a court ruled Tuesday.

A federal judge ruled the Treasury Inspector General for Tax Administration (TIGTA) must disclose to watchdog group Cause of Action whether records of an investigation exist.

Cause of Action filed a Freedom of Information Act (FOIA) lawsuit after TIGTA refused to confirm or deny the existence of the investigation in what is commonly known as a “Glomar response.”

“The court has ruled that the federal government cannot hide behind confidentiality laws to prevent Americans from knowing if our President has gained unauthorized access to their tax information,” Cause of Action executive director Dan Epstein said in a statement Tuesday. “This is a decisive win for all Americans and for government transparency and accountability.”

Former White House Council of Economic Advisers chairman Austan Goolsbee sparked a mini-scandal in 2010 when he told reporters during a background press briefing that Koch Industries—the company of libertarian philanthropists Charles and David Koch—paid no income taxes.

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