The Polish government has petitioned the European Court of Justice against the EU over the latter's demand that Poland allow tens of thousands of migrants from Muslim countries to enter its territory.
Last June the EU sued Poland, the Czech Republic and Hungary claiming that the three countries are opposed to the "Division Plan" of the EU in which countries take a fixed amount of Muslim migrants.
Poland has now transferred the case to the ECJ, stating that it is not obligated to take in migrants.