MADISON, Wis. (AP) — A lawsuit filed Wednesday asks Wisconsin’s newly liberal-controlled state Supreme Court to throw out Republican-drawn legislative maps as unconstitutional, the latest legal challenge of many nationwide that could upset political boundary lines before the 2024 election.

The long-promised action from a coalition of law firms and voting rights advocacy groups comes the day after the Wisconsin Supreme Court flipped from a conservative to liberal majority, with the start of the term of a justice who said that the Republican maps were “rigged” and should be reviewed.

The Wisconsin lawsuit is just one of many expected or pending court challenges that could force lawmakers or special commissions to draw yet another set of maps before the 2024 election. In one of the most recent examples, Alabama lawmakers passed new congressional districts last month after the U.S. Supreme Court ruled in June that its districts violated federal law by diluting the voting strength of Black residents. Voting rights advocates are challenging the new map as well, contending it still falls short.

All states were required to redraw voting district boundaries after the 2020 census. In states where one political party controlled that process, mapmakers often sought to create an advantage for their party by packing opponents’ voters into a few districts or spreading them among multiple districts — a process known as gerrymandering.

The latest challenge asks the Wisconsin Supreme Court to take the case directly, rather than have it work through lower courts, arguing that the state legislative maps are an unconstitutional gerrymander. Notably, the lawsuit does not challenge the congressional maps.

“Despite the fact that our legislative branch is meant to be the most directly representative of the people, the gerrymandered maps have divided our communities, preventing fair representation,” said Jeff Mandell, board president of Law Forward, one of the groups that brought the lawsuit. “This has eroded confidence in our political system, suppressed competitive elections, skewed policy outcomes, and undermined democratic representation.”

Republican legislative leaders did not immediately return messages seeking reaction to the lawsuit.

In addition to Law Forward, others who brought the lawsuit on behalf of Wisconsin voters are the Stafford Rosenbaum law firm, Election Law Clinic at Harvard Law School, Campaign Legal Center, and the Arnold & Porter law firm.

In 2021, the conservative-controlled Wisconsin Supreme Court decided that it would adopt maps that had the least amount of change as possible from the previous maps drawn in 2011 by Republicans. Those maps, which also survived a challenge that went all the way to the U.S. Supreme Court, were widely regarded as among the most gerrymandered in favor of Republicans in the country.

In a sign of how much the 2011 maps entrenched Republican power in the Legislature, Democrats won every statewide race in 2018 and 53% of the statewide legislative vote. And yet, Democrats won just 36 of the state’s 99 Assembly seats.

Republicans currently hold a 64-35 majority in the Assembly and a 22-11 majority in the Senate. Under the new maps, Republicans picked up a congressional seat in the 2022 election and now hold six of the state’s eight seats.

The state Supreme Court in 2022 initially adopted a map drawn by Democratic Gov. Tony Evers, plans that largely preserved the district lines favoring Republicans.

But the U.S. Supreme Court in March 2022 rejected the legislative maps while it accepted the congressional map. The high court ruled that Evers’ legislative map failed to consider whether a “race-neutral alternative that did not add a seventh majority-black district would deny black voters equal political opportunity.”

The Wisconsin Supreme Court, on a 4-3 vote then adopted Republican-drawn legislative maps. The court’s three liberal justices dissented. They are now in the majority with the arrival of Justice Janet Protasiewicz, whose 10-year term began Tuesday.

Protasiewicz ran with support from Democrats and other critics of the current maps and was outspoken during the campaign about her desire to revisit the issue.

“The map issue is really kind of easy, actually,” Protasiewicz said during a candidate debate. “I don’t think anybody thinks those maps are fair. Anybody.”

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Associated Press writer David A. Lieb, in Jefferson City, Missouri, contributed to this report.