In addition to the investigations of Mr. Manafort and Mr. Gates, who pleaded guilty in February to numerous financial crimes and became a cooperating witness in the special counsel investigation, Mr. Mueller’s team pursued three other investigations into lawyers and lobbyists who did work in Ukraine.
The cases involve Gregory B. Craig, who served as the White House counsel under President Barack Obama before leaving to work for the law firm Skadden, Arps, Slate, Meagher & Flom; Tony Podesta, an influential Washington lobbyist whose brother, John D. Podesta, was chairman of Hillary Clinton’s presidential campaign; and former Representative Vin Weber, Republican of Minnesota, who joined the lobbying firm Mercury Public Affairs after leaving Congress.