MADISON, Wis. (AP) — Voters in Wisconsin will face a choice Tuesday of participating in a presidential primary election or heeding warnings from public health officials to stay away from large crowds during the coronavirus pandemic.

Hours after Democratic Gov. Tony Evers issued an order postponing the election for two months, the conservative-controlled Wisconsin Supreme Court on Monday sided with Republicans who said he didn’t have the authority to reschedule the race on his own. Conservative justices on the U.S. Supreme Court quickly followed with a ruling blocking Democratic efforts to extend absentee voting.

The decisions leave Wisconsin as the only state with an election scheduled in April that is proceeding as planned. As other states prepare to vote in May or June, Wisconsin will be closely watched for signs that fears of the coronavirus may depress turnout or cause other problems at the polls.

Evers said he had no other options after the state court ruled against him.

“There’s not a Plan B. There’s not a Plan C,” Evers said earlier Monday. After the court rulings, Evers said voters will now have to “wake up and have to choose between exercising their right to vote and staying healthy and safe. ”

Joe Biden already has a commanding delegate lead over Bernie Sanders and the Wisconsin results aren’t likely to slow his march to the Democratic presidential nomination. But the tumult in one of the most critical general election battlegrounds was a reminder of how the coronavirus has upended politics during an election year. Beyond the shifts in the primary calendar, Biden and President Donald Trump have not been able to hold in-person campaign events and have moved most of their operations online.

The tension in Wisconsin over whether and how to proceed with the election has been building for weeks. Evers and Republicans initially agreed it was imperative for the election to proceed because thousands of local offices are on the ballot Tuesday for terms that begin in two weeks. There is also a state Supreme Court election.

Evers himself had questioned whether he had the power to reschedule the election, but said the worsening situation, including an increase in COVID-19 deaths from 56 on Friday to 77 on Monday, made clear there was no way to safely move forward. Evers said he sought the delay because he was motivated by protecting public health, not politics.

“The people of Wisconsin, the majority of them, don’t spend all their waking hours thinking about are Republicans or Democrats getting the upper hand here,” Evers said earlier Monday. “They’re saying they’re scared. They’re scared of going to the polls.”

He was thwarted by conservatives on two courts. The Wisconsin Supreme Court ruled 4-2, with four conservatives in support and two liberals against, that Evers lacked the authority to move the election on his own.

The U.S. Supreme Court split 5-4, with the five Republican-appointed justices siding with the national and state party to overturn a lower court ruling that had expanded absentee voting. In an unsigned opinion, the court said absentee ballots must be hand-delivered by Tuesday evening or postmarked by Tuesday, although they can arrive at clerks’ offices as late as April 13.

In dissent, Justice Ruth Bader Ginsburg wrote for her liberal colleagues that the lower court acted amid the virus outbreak “to safeguard the availability of absentee voting in Wisconsin’s spring election. This Court now intervenes at the eleventh hour to prevent voters who have timely requested absentee ballots from casting their votes.”

Ginsburg said the coronavirus outbreak had caused a surge in absentee ballot requests and thousands of voters who requested them will not have received their ballots by Tuesday. “The Court’s order, I fear, will result in massive disenfranchisement,” she wrote.

The lower court order that extended absentee balloting through April 13 had stipulated that election returns not be announced until then. Wisconsin Election Commission spokesman Reid Magney said that portion of the lower court’s order remained in effect.

As of Monday, nearly 1.3 million absentee ballots had been requested but only about 57% of those had been returned. It’s unclear how many of the outstanding 539,000 ballots will be in voters’ hands by Tuesday to meet the April 7 postmark deadline.

The conservatives said “the dissent’s rhetoric is entirely misplaced and completely overlooks the fact that the deadline for receiving ballots was already extended to accommodate Wisconsin voters, from April 7 to April 13.”

Wisconsin Democratic state Sen. Jon Erpenbach said Republicans fought efforts to delay the election because they want to suppress turnout, particularly in Democrat-heavy Milwaukee, because that will benefit Republicans.

“Democrats have always been good about getting out the vote on the day of,” Erpenbach said. “If you’re looking at the newspapers, watching TV, you know right now it’s dangerous.”

Democratic U.S. Rep. Mark Pocan said conservatives on the courts and Republicans in the Wisconsin Legislature “think it’s OK to jeopardize your health to vote. Idiotic.”

“Each person will have to make their individual decision, and if it is to vote, please do it safely,” Pocan said.

Ohio saw a similar eleventh-hour flurry the day before its primary last month. After the Republican governor and secretary of state failed to persuade a judge to shift the election date, the state health director stepped in and ordered voting shut down. Legislators set a new, almost all-mail primary for April 28, sparking new legal challenges from voting rights groups, but a federal judge on Friday said the election could go forward.

Ahead of the Wisconsin primary, thousands of poll workers said they wouldn’t work, leading Milwaukee to reduce its planned number of polling sites from 180 to just five. More than 2,500 National Guard troops were dispatched to staff the polls. They were also distributing supplies, including hand sanitizer, to polling sites across the state. In Madison, city workers were erecting Plexiglas barriers to protect poll workers, and voters were encouraged to bring their own pens to mark the ballots.

George Dunst, 76, of Madison, who has volunteered at his local polling site for nearly every election since he retired, said he’s not going Tuesday amid fears of contracting COVID-19.

“No matter what safety precautions you take, there’s going to be exposure,” he said. “Who knows who comes into the polling place?”