MADISON, Wis. — The Wisconsin Supreme Court struck down Democratic Gov. Tony Evers’ statewide mask mandate on Wednesday, stripping the governor of one of his last remaining tools to curb the spread of the coronavirus as the state stands on the precipice of another surge in infections.

The conservative-leaning court ruled 4-3 that Evers violated state law by unilaterally issuing multiple emergency orders to extend the mandate for months. It found that Evers needed legislative approval to issue more orders after the expiration of the initial 60-day mandate he issued in August.

“The question in this case is not whether the governor acted wisely; it is whether he acted lawfully. We conclude he did not,” Justice Brian Hagedorn wrote for the majority.

The decision marks another legal defeat for Evers. The state Supreme Court in May struck down his stay-at-home order, finding that his health secretary lacked the authority to issue such an order. A state appeals court blocked Evers’ attempts to limit capacity in bars, restaurants and other indoor places in October.

Wednesday’s decision comes as COVID-19 cases have been rising in the state. The seven-day daily case average has jumped from fewer than 400 in mid-March to 470 as of Wednesday. State Department of Health Services Secretary Julie Willems Van Dijk said the state is seeing “warning signs” that another surge in infections is about to begin.

Local mask mandates remain in place. The city of Milwaukee and Dane County, which is home to the state capital of Madison, both have issued such mandates. But invalidating the statewide order leaves Evers with few options to slow the virus’ spread on a broad scale.

Evers said in a statement that he’s trying to keep Wisconsin residents safe and that he used science to guide his decisions. He promised to keep working to get people vaccinated and urged people to continue to wear masks.

Justice Ann Walsh Bradley, a member of the court’s three-justice liberal minority, lamented in a dissenting opinion that the ruling hampers the ability of Wisconsin governors to protect lives.

“This is no run-of-the-mill case,” she wrote. “We are in the midst of a worldwide pandemic that so far has claimed the lives of over a half million people in this country. And with the stakes so high, the majority not only arrives at erroneous conclusions, but it also obscures the consequence of its decision. Unfortunately, the ultimate consequence of the majority’s decision is that it places yet another roadblock to an effective governmental response to COVID-19.”

Republican lawmakers applauded the ruling. Senate Majority Leader Devin LeMahieu said Evers abused his power and that the court’s decision affirms the separation of powers between the legislative and executive branches. Assembly Speaker Robin Vos said people and businesses should be free to make their own decisions about what’s best for them “and don’t need state government telling them how to live their lives.”

Evers argued that he could issue multiple health emergencies because of the changing nature of the pandemic. The mask order first took effect in August and Evers extended it four times since then, most recently on Feb. 4 immediately after Republican legislators repealed it.