Politically motivated change of heart? ZUS withdrew its case from Supreme Court

There was a complaint, but not anymore. The Polish Social Insurance Institution (ZUS) withdrew its appeal from the Supreme Court. In result of the appeal, the Supreme Court sending questions for preliminary ruling to the European Court of Justice, regarding recent reforms to the judicial system. ZUS was concerned that the state budget was losing money, now the opposition is asking what happened that the institution changed its mind, and could this be a political decision.