Crowds gathered in major cities across Poland — including Warsaw, Krakow and Poznan — on Sunday to show support for the country's membership of the EU.

Demonstrators gathered in Warsaw's Castle Square waving Polish and EU flags. They sang the national anthem and chanted "We stay" and "We are Europe!" 

The rallies come after a top court ruling that said the Polish constitution overrides some EU laws. Critics of Poland's conservative ruling party PiS say the court is stacked with its allies and is therefore illegitimate. They worry the latest ruling could lead to Poland's exit from the EU.

DW correspondent Jack Parrock said protesters at the rally were sending a clear message that they want to stay in the EU, many told Parrock they worried their children would grow up outside of the bloc.

"Back in 2003 when Poland signed the EU treaties to join the EU on this very square there were similar scenes, EU flags being flown, but back then there was jubilation, this time there is a concern and the demand that the government turns its back on this suggestion and this campaign to try and keep the polish constitution above certain parts of EU law," Parrock said.