And no one may feel more heat than Paul Manafort. In Washington legal circles, there’s a broad expectation that Mueller will file what’s called a superseding indictment of Manafort and Rick Gates, his erstwhile business partner—and alleged partner in crime. Gates and Manafort both pleaded not guilty when Mueller’s team filed their indictment on Oct. 30. Legal experts say there may be more charges to come.

“I would expect a superseding indictment to come down relatively soon,” said Jonathan Turley, a professor at George Washington University’s law school.

“There was much in the narrative of the indictment that referenced crimes not charged,” he added. “Prosecutors will often issue a superseding indictment as the grand jury continues its work. There’s also a tactical reason for this, that superseding indictments tend to grind defendants a bit more over time.”