Swedes are heading to the polls on Sunday in a closely watched general election that could return the center-left opposition to power after four years or reshape the country’s government with a greater role for the far-right Sweden Democrats.

Opinion polls ahead of the vote have generally shown the left-wing alliance leading the right-wing bloc headed by incumbent Prime Minister Ulf Kristersson. However, the opposition’s advantage has narrowed as election day approaches, raising the prospect of a tight contest.

The four-party opposition alliance is led by former Prime Minister Magdalena Andersson, leader of the center-left Social Democrats, who served as Sweden’s first female prime minister from 2021 to 2022.

“We all knew it was going to be a very close election; I’ve said that all along,” Andersson told supporters at a rally in Stockholm on Saturday.

“Now it’s up to voters: do they want a government that will be totally dominated by the Sweden Democrats, or do they want a government led by me?” she said.

The Social Democrats, who have governed Sweden for much of the past century and remain the country’s largest political party, are campaigning on strengthening the welfare system and helping households cope with rising living costs.

Kristersson and his allies, meanwhile, have emphasized the government’s record on combating violent and organized crime and pursuing tighter immigration policies.

Supporters of the governing bloc argue that its policies have strengthened public safety and immigration controls. Critics contend that some of the measures risk undermining civil liberties and disproportionately affecting immigrant communities.

Kristersson has defended his government’s approach, arguing that cooperation among parties on the right has allowed it to implement its agenda.

“We can unify parties, voters and issues into joint action. That’s why we get things done,” Kristersson told parliament this week.

Sunday’s vote will determine the composition of Sweden’s 349-seat parliament, the Riksdag, and set the stage for negotiations over the formation of the country’s next government.