The Justice Department on Friday charged Samuel Patten, a former associate of Paul Manafort, with failing to file as a foreign lobbyist for his work for a Ukrainian political party. Patten is expected to plead guilty Friday morning.

Though Patten worked alongside Manafort and worked with Manafort associate Konstantin Kilmnik, the case is being handled by the U.S. attorney in Washington and the Justice Department’s National Security Division, not special counsel Robert Mueller.

The docket in the case shows Patten is scheduled to appear for his arraignment and a plea agreement hearing in federal court in Washington, D.C. at 11 a.m. ET Friday.

The charging document filed Friday accuses Patten of acting as a foreign agent for the Opposition Bloc, a Ukrainian political party, between 2014 and 2018 without registering with the U.S. government. Prosecutors charge in the filing that Patten owned a consulting company with an unnamed Russian national and was paid by a Ukrainian oligarch through a Cypriot account.

As part of his work for the Opposition Bloc, Patten was in contact with members of Congress, the executive branch, and members of the American media, according to the charging document. He also allegedly arranged for the unnamed Russian national and unnamed Ukrainian oligarch to meet with members of Congress and their staff, per the filing. Specifically, he set up meetings in January 2015 between the Ukrainian oligarch and members of the congressional foreign relations committees, staffers at the State Department and American journalists, according to prosecutors.

Patten acknowledged his collaboration with Kilimnik on Begemot, which he said operates entirely abroad despite its D.C. address. Patten also confirmed his work with Cambridge Analytica, saying he assisted the firm’s U.S. operations in 2014, and also worked with the company on “several overseas campaigns.” He declined to go into further detail, citing a nondisclosure agreement, but stressed that his work for Begemot and Cambridge Analytica were entirely separate.

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There is little public information about Begemot, whose name literally translates (from Russian) to hippopotamus but also may be a reference to a character in the Russian novel The Master and Margarita.

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Patten expressed skepticism about Mueller’s recent allegations about his colleague. “A lot of people in our country wish Mueller well. If this is his ace in the hole, I am profoundly depressed,” he said.

“I have no reason to suspect him of being a Russian agent,” Patten added.