...Powell began with a short opening statement and then responded to questions posed by the 10 active judges hearing the appeal. (Judge Gregory Katsas did not participate in the en banc proceedings.) Jeff Wall, the acting solicitor general, argued next on behalf of the government, followed by Beth Wilkinson, the private attorney retained to represent Sullivan. Powell and Wall concluded with short, two-minute rebuttals. The questions posed focused mainly on the propriety of mandamus in the Flynn case given that Sullivan has not yet ruled on the government’s motion to dismiss. Mandamus is an extremely rare remedy, appropriate only when...