The overseer of the Guantánamo war court who was fired without explanation told the 9/11 trial judge in an affidavit obtained by the Miami Herald that he was considering plea deals in the terror case and took a number of other actions. At issue is whether Secretary of Defense Jim Mattis’ surprise Feb. 5 firing of Military Commissions Convening Authority Harvey Rishikof constituted meddling in ongoing cases, known as unlawful influence in court proceedings. The war court convening authority…