Lawyers for a whistleblower who’s filed a complaint against Donald Trump’s spy chief are threatening to sue if she doesn’t move forward with disclosing the allegations it contains.

The highly classified complaint is said to accuse Director of National Intelligence Tulsi Gabbard of concealing a report about suspected foreign intelligence officials discussing a figure close to the president.

“Our client—with legal counsel present—desires to meet directly with the intelligence committees to ‘submit the complaint or information’ that is contained within their ‘urgent concern’ complaint,” attorneys Andrew Bakaj, Mark Zaid, and nonprofit Whistleblower Aid wrote in a letter to Gabbard’s office Wednesday morning, shared with the Daily Beast.

“All that is needed and that we await is the appropriate security guidance on how to do so,” they added, setting a deadline of Friday. “Please note that your failure to do so may lead to our pursuing litigation before the appropriate U.S. District Court to compel the DNI’s compliance with the law.”

Bakaj has accused Gabbard’s office of trying to bury the whistleblower complaint for eight months as it remains under lock and key in a safe at the office of the intelligence community’s inspector general.

Last week, he sent a letter to Gabbard with an ultimatum to provide security guidance on how to brief Congress on the contents of the complaint, which is required for it to move forward. He threatened to go directly to the House and Senate intelligence committees if no guidance was provided. That deadline was set for Friday, but Gabbard’s office fired back on Monday with a warning that the whistleblower’s legal team would risk possible prosecution if they disclosed classified information to Congress.

“The highly classified nature of the underlying complaint increases the risk that you or your client inadvertently or otherwise breaks the law by divulging or mishandling classified information,” ODNI general counsel Jack Dever wrote. “You may have other means of appearing in front of Congress, but this is not it.”

Bakaj has accused Gabbard of stonewalling on the complaint after the whistleblower asked that it be transmitted to Congress eight months ago. ODNI has called those accusations “baseless.”

The Wall Street Journal first reported the existence of the classified complaint and accusations against Gabbard on Feb. 2. That same day, ODNI provided the intelligence community inspector general with security guidance to transmit the complaint to Congress after months of delays.

In his communication to the top officials on the congressional intelligence committees on Feb. 2, Inspector General Christopher Fox wrote that the complaint would be available for the so-called “Gang of Eight” to review.