Newly elected Poland's Prime Minister Donald Tusk, center, is congratulated by lawmakers after his government passed a confidence vote at the parliament in Warsaw, Poland, Dec 12, 2023. (PHOTO / AP)

WARSAW - New Polish Prime Minister Donald Tusk's government was sworn in by the president on Wednesday, the final step in a transfer of power that marks a huge change after eight years of nationalist rule.

After years of disputes between Warsaw and Brussels under the previous government, led by the Law and Justice (PiS) party, the appointment of former European Council President Tusk has raised hopes of smoother relations with the rest of the European Union.

Poland's Constitutional Tribunal ruled on Monday that judicial reform legislation which Poland needed to pass to access EU funds was unconstitutional

In a speech to parliament on Tuesday, Tusk vowed to secure billions of euros for Poland that have been frozen by the EU over concerns about the rule of law.

However, his task could be complicated by judges appointed under PiS reforms that critics said undermined the independence of the courts and by the power to veto laws held by President Andrzej Duda, a PiS ally.

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"You have to be optimistic," Tusk told reporters as he set off for the swearing-in ceremony at the presidential palace. "I hope that we have common goals, even if we have different paths and experiences. Nobody has any doubts that we need to serve Poland."

Poland's Constitutional Tribunal ruled on Monday that judicial reform legislation which Poland needed to pass to access EU funds was unconstitutional.

It reached the same conclusion about penalties imposed by the EU's top court before it reaches a final ruling, known as interim measures.

Tusk is expected to travel to Brussels for an EU summit takes which place on Thursday and Friday.