James Comey asserted in his extraordinary testimony before the Senate Intelligence Committee that the director of the Federal Bureau of Investigation is authorized to override Justice Department oversight procedures, a questionable claim which if true would raise serious questions about long-standing rules aimed at preventing abuses by federal law enforcement officials. The former head of the FBI told the Senate panel that he believed he had received a direction from the president in February that the FBI end its investigation of Michael Flynn’s alleged involvement with Russia–a direction with which he and his kitchen-cabinet of “FBI senior leadership” unilaterally decided...