A new report from NBC News reveals that mega-lobbyist Tony Podesta is now facing a criminal inquiry as part of Special Counsel Robert Mueller’s Russia investigation.

Sources say that Mueller’s investigation “has now morphed into a criminal inquiry” about whether the Podesta Group violated the Foreign Agents Registration Act, according to the report.

The Podesta Group filed a FARA registration retroactively after reports revealed that they received payments from a think tank funded by a foreign government.

Tony Podesta is the brother of John Podesta, Hillary Clinton’s former presidential campaign chairman. The two brothers have spent decades successfully leveraged each other’s ties to create more power, wealth and influence for themselves and their causes.

A spokesperson from the lobbying behemoth tells NBC that the Podesta Group is cooperating with the investigation.