The declassification of material from the Michael Flynn case has exposed more chilling details of an effort by prosecutors to come up with a crime to use against the former national security adviser. This week, however, a letter revealed another unsettling detail. Among over three dozen Obama administration officials seeking to “unmask” Flynn in the investigation was former Vice President Joe Biden. This revelation came less than a day after Biden denied any involvement in the investigation of Flynn. It also follows a disclosure that President Obama was aware of that investigation.