The Missouri Supreme Court unanimously blocked a Republican-drawn congressional map on September 3, 2026, preventing its use in November’s midterm elections and instead placing the contested redistricting plan on the ballot for voters to decide. The court ruled that the 2025 map cannot be used in the general election or any future election unless Missouri voters approve it first, restoring the previous congressional boundaries from 2022 and 2024 for the November contest.
The decision marks a rare setback for Republicans in the national battle over redistricting. Missouri’s new map, redrawn at the urging of President Donald Trump, was designed to flip the state’s 5th Congressional District from Democratic to Republican, threatening the seat held by longtime U.S. Representative Emanuel Cleaver since 2005. The court’s ruling prevents that outcome from taking effect without voter approval.
The legal fight centered on a referendum petition signed by nearly 300,000 Missouri residents challenging the map. Missouri’s Secretary of State Denny Hoskins, a Republican, rejected the petition as legally insufficient on August 4—the same day as the state primary, which was held under the new 2025 map. The Missouri Supreme Court reversed that decision, finding that “the referendum petition was legal, sufficient, and timely” under the state constitution’s provision allowing voter-initiated referenda on any act of the general assembly.
The map will appear on the November ballot as Proposition A, asking voters whether to approve the legislation redrawn by the Republican-controlled legislature. A “yes” vote would enact the new map; a “no” vote would reject it. The group People Not Politicians, which spearheaded the petition campaign, raised $7 million through June and is urging voters to reject the plan, while Republicans have organized a counter-campaign called Put Missouri First, which has raised $3 million so far.
The ruling created immediate complications for election administration. Missouri law required the new map to take effect in 2025, and the state primary in August was held under those boundaries, with winners certified for the November ballot. The court’s decision to use the old map for the general election means voters will choose representatives under different district lines than those used in the primary—a scenario with no recent American precedent, according to Missouri’s Attorney General Catherine Hanaway.
Republican officials vowed swift appeals. Hanaway said she would immediately seek relief from the U.S. Supreme Court, calling the ruling “a full-fledged constitutional crisis.” Trump himself denounced the decision on social media, saying it was “horrible, ridiculous, and unConstitutional.” However, the court’s opinion addressed the federal constitutional argument that will likely form the basis of any appeal, noting that the U.S. Supreme Court reaffirmed just three years prior that the federal Elections Clause does not prohibit state referenda on congressional redistricting.
The Missouri case reflects a broader national trend of mid-decade redistricting unprecedented in modern times. In 2025 and 2026, roughly 10 states redrew their congressional maps between census cycles—a strategy Trump initiated by encouraging Republican-led legislatures to redraw boundaries to benefit the GOP. Texas, North Carolina, and Ohio also pursued mid-decade maps, while California redrawn its lines to favor Democrats. The Missouri ruling stands in contrast to a Virginia precedent where the state Supreme Court in May 2026 struck down a voter-approved redistricting referendum backed by Democrats, finding procedural errors in the legislative process.
The outcome is particularly significant for Missouri’s 5th Congressional District, which encompasses parts of Kansas City and has been represented by Cleaver, a Democrat, for two decades. The 2025 map divided the district to reduce Democratic voting strength, a move that prompted Cleaver to file for reelection under the new boundaries despite the uncertainty. The court’s decision restores the district’s previous shape, improving his electoral prospects in the November general election.
Sources
- Al Jazeera — the Missouri Supreme Court’s unanimous ruling blocking the 2025 map, its legal reasoning on the referendum petition, and Republican appeals
- Missouri Independent — the court’s decision to place the map on the November ballot, the petition campaign’s history, and the impact on the 5th District race
- NBC News — the court ruling preventing the GOP-drawn map from being used in the November midterm elections
- Washington Post — the court’s decision throwing out the GOP-backed map and the impact on Democrats
- CBS News — the ruling as a win for Emanuel Cleaver and the Democratic party
