Is there an avenue for the prosecutor to claim the judge is hostile to the government's side, and request a different judge? Or is his only choice to slog thro

Is there an avenue for the prosecutor to claim the judge is hostile to the government's side, and request a different judge? Or is his only choice to slog through the "uphill battle", and perhaps appeal the decision at the end? I don't think modifying hardware you've purchased should be illegal, but it does seem odd to me that a judge can show that much emotion and still be considered a fair judge of an open case.