The Department of Justice, after concluding that the prosecution of Michael Flynn was the product of misconduct by FBI and DOJ officials, moved to drop the case against Flynn.
But not so fast. Flynn pleaded guilty, a plea that the DOJ motion to drop the charges calls into question. A judge has discretion whether to allow a case to be dropped, but normally if the prosecution doesn't want to prosecute, a judge will not force a prosecution. But where a guilty plea has been entered and accepted by the court, and a motion to withdraw the plea rejected by the court, the court has a lot more power because the prosecution, in a sense, is over already. Only sentencing remains.