The former liberal Polish premier and arch-rival of the governing Law and Justice (PiS) party spoke at a time when Poland is mired in conflict with the EU over various issues, including the controversial judicial reforms that led Brussels to launch unprecedented disciplinary proceedings against Warsaw last month.
"For PiS the benefit of being in the EU boils down to the balance of payments, with a complete disregard for other benefits like the common market, legal order, guaranteed security, etc," Tusk told the Tygodnik Powszechny news weekly.
This week the country's new Prime Minister Mateusz Morawiecki sacked his defence and foreign ministers in a major cabinet reshuffle and met with European Commission President Jean-Claude Juncker as part of the governing party's quest to mend the strained ties.
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Never before used against an EU member state, the proceedings can eventually lead to the "nuclear option" of the suspension of a country's voting rights within the bloc.
But Tusk said "the PiS can still end this crisis by abandoning the changes to the judiciary."
The PiS government began making the changes after coming to power in late 2015 and says the reforms are needed to combat corruption and overhaul the judicial system still haunted by the communist era.
"In Brussels there's still a huge surplus of hope -- I'm not saying trust, that unfortunately vanished already -- that Poland will nevertheless remain in the EU," Tusk said.
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