About 190,000 registered candidates running for local government positions, including mayors and councillors.

Voters on Sunday will elect mayors as well as members of municipal councils and provincial assemblies, with nearly 190,000 registered candidates running for local government positions in the Central European nation of 38 million people.

Tusk’s appointment as prime minister in December marked a turning point for the largest country in the European Union’s east, drawing a line under eight years of nationalist rule that set Warsaw at odds with Western allies and putting the nation of 38 million people on a resolutely pro-European course.

The broad coalition which Tusk leads won a majority in October’s parliamentary elections on promises to roll back judicial reforms implemented by the last government that critics said undermined the independence of the courts while boosting the rights of women and minorities.

He has painted victory on Sunday for his liberal Civic Coalition (KO), the largest grouping in the ruling alliance, as essential if Poland is to avoid sliding back towards nationalist rule under the Law and Justice party (PiS).

“Our dream – once a beautiful dream, and today an increasingly better reality – may end overnight,” he told a rally in Warsaw on Friday, before an election blackout began.

“If someone believes that freedom, human rights, women’s rights, democracy, free economy, self-government – that all this is permanent, will defend itself … we will lose it all again.”

PiS has repeatedly rejected accusations that it undermined democracy and human rights.

‘Yellow card’

With the three groups that form the ruling coalition running on separate tickets, the vote is also a chance for Tusk to cement KO’s dominance in government.

Elections to the European Parliament are scheduled for June, and Sunday’s results will be closely watched in Brussels.

While Tusk has unblocked billions in EU funds that were frozen over rule-of-law concerns and launched sweeping changes in the courts and state media, he has also faced criticism for not delivering on a host of election promises and questions over the legality of some reforms, particularly regarding the media.

For PiS leader Jaroslaw Kaczynski, the local elections offer a chance to send a warning shot to a government he accuses of lying about what it could achieve and about the record of the previous administration.

“We have a chance … to show the authorities who are at the helm in Warsaw today a yellow card,” he told supporters on Friday, in a reference to the way football referees warn players.

Run-off votes will take place two weeks later, on April 21, in cases where mayoral candidates do not win at least 50 percent of the vote in Sunday’s first round.