Special counsel John Durham, the prosecutor appointed to investigate potential government wrongdoing in the early days of the Trump-Russia probe, leaves federal court in Washington, Monday, May 16, 2022. Photo: Manuel Balce Ceneta/AP

The acquittal of former Perkins Coie Michael Sussmann this week has led to renewed criticism that Special Counsel John Durham is pursuing a political errand with his probe into the FBI's Russia investigation.