MADISON, Wis. (AP) — Gov. Tony Evers on Thursday closed all K-12 schools for the remainder of the academic year and extended Wisconsin’s stay-at-home order for another month, keeping most nonessential businesses shuttered until after the Memorial Day holiday weekend to slow the spread of the coronavirus.

Wisconsin Republicans reacted with anger to Evers’ extension, threatening lawsuits, the firing of his health secretary and other curbs on his power. The president of Wisconsin Manufacturers and Commerce, the powerful state chamber of commerce, also called the legality of the order into question, saying it will lead to more businesses closing and people losing their jobs.

More than 1,400 people said on Facebook that they planned to attend a rally at the state Capitol on April 24, the day the original order was to end, demanding that Evers reopen the state.

The action came on the same day that President Donald Trump’s administration outlined a phased approach to restoring normal commerce and services, but only for places with strong testing and a decrease in COVID-19 cases.

Evers stood firm, saying the stay-at-home order in place since March 25 has already saved between 300 and 1,400 lives.

“Folks, we’ve saved lives together,” Evers said. “At the end of the day, my bottom line is keeping people safe and we’re not out of the clear just yet.”

But Republicans voiced their loudest objections to date, especially in the state Senate which has yet to confirm Department of Health Services Secretary Andrea Palm and could vote to fire her. The Senate has already fired Evers’ agriculture secretary.

“She must not be allowed to continually trample on the constitution or the state’s economy,” Republican Sen. David Craig said of Palm. “Enough is enough!”

Rep. Barb Dittrich, of Oconomowoc, called Evers a “tyrant.”

Senate Majority Leader Scott Fitzgerald and other Republicans called for loosening restrictions on more rural parts of the state that haven’t been as greatly affected by COVID-19 as urban areas like Milwaukee.

Fitzgerald said senators were looking at “legal or legislative relief.”

Before the order can be lifted, there needs to be a “massive” expansion of testing, more contact tracing to determine the spread of the virus and additional public health measures to prevent another wave, Evers said.

“You can’t think of this like flipping a light switch. It’s like turning a dial,” Evers said. “Things won’t get back to normal until there’s a vaccine and treatment for this disease.”