Poland remains fully committed to the European Union despite a series of bruising battles with Brussels and any political party that advocated following Britain out of the bloc would be rejected by Polish voters, President Andrzej Duda told Reuters. The EU, which Poland joined in 2004, has sharply criticized Poland’s ruling right-wing Law and Justice party (PiS) over its reforms of the constitutional court, state media and other measures, saying they undermine the rule of law.

This month Poland was further isolated in the EU after it tried in vain to block the reappointment of Donald Tusk, a former Polish prime minister and arch rival of PiS leader Jaroslaw Kaczynski, as chairman of the European Council. Polish Prime Minister Beata Szydlo has also said Warsaw might refuse on Saturday to endorse a declaration in Rome to mark the EU’s 60th anniversary unless its concerns over the bloc’s future course are properly addressed. On Friday she softened that stance before taking off for Rome. President Duda, an ally of Kaczynski and Szydlo, said Poland only wanted to be treated as a fully equal partner in the EU and that there was no question of Poland leaving the bloc. “Today any party which came out and openly said ‘We are a group … that is striving to quit the EU, we don’t want Poland in the EU’ would have no chance on the Polish political scene,” Duda said in an interview authorized for publication on Friday. “We want a Union of free and equal nation states.”

Poland is the largest beneficiary of EU funds and is due to receive 77.6 billion euros ($83.82 billion) in the current 2014-20 budgetary period for infrastructure projects, its poorer regions and improving the competitiveness of its economy.