US District Judge Emmett G. Sullivan unquestionably knows that when a federal defendant pleads guilty but then asks to be relieved of his fate, it is up to the court to decide the merit of his argument — no matter who supports it, including a prosecutor who has switched sides. Sullivan is presiding over the case in which former National Security Adviser Michael Flynn pleaded guilty twice to serious federal crimes and is ready for sentencing. The fly in the ointment is a recent request by Attorney General William Barr that basically says: Never mind. Ignore those guilty pleas; Flynn...