Investigators into Russian attempts to subvert American democracy grievously mistreated Gen. Michael Flynn, now convicted of perjury related to the investigation. Some of the prosecutors should themselves face professional punishment for their misbehavior.

As this site’s resident defender of special counsel Robert Mueller, I am obligated to insist that the investigators themselves uphold the same standards they would apply to others. Without excusing Flynn’s lies to investigators, a fair-minded observer can call foul on an obviously unfair, and perhaps unlawful, perjury trap.