sentences:  In 2001 Libby left the firm to return to work again in government, as Vice President Cheney's chief of staff.Fugitive billionaire commodities trader Marc Rich, who, along with his business partner Pincus Green, had been indicted of tax evasion and illegal trading with Iran, and who, with Green, was ultimately pardoned by President Bill Clinton, was a client whom Leonard Garment had hired Libby to help represent around the spring of 1985, after Rich and Green had first engaged Garment.Libby stopped representing Rich in the spring of 2000; early in March 2001, at a "contentious" Congressional hearing to review Clinton's pardons, Libby testified that he thought the prosecution's case against Rich "misconstrued the facts and the law".