Missouri’s highest court upheld a mid-decade redistricting plan on Tuesday, setting up new U.S. House district lines for the 2026 midterm election cycle and bolstering Republicans’ electoral strategy heading into filing deadlines. The Missouri Supreme Court’s ruling kept the map in place after opponents argued the state constitution limits congressional redistricting to the period immediately following a census.
The court’s decision, issued by a 4-3 vote, rejected a challenge centered on the meaning of the word “when” in a provision requiring the General Assembly to redraw congressional districts “when” new census data is certified. Attorneys for the plaintiffs said “when” should be read to allow redistricting only when new census data exists, which they argued was not the case in the middle of the decade.
In response, Missouri’s Republican leadership argued that the constitutional language sets only a minimum and does not expressly forbid additional redistricting. The Missouri attorney general’s office and the Missouri Republican State Committee said the constitution did not contain an explicit limitation such as “shall not” or “solely” or “only,” a reading that the Supreme Court adopted in upholding the new districts, according to the reporting.
The ruling marked a legal victory for President Donald Trump in a nationwide redistricting dispute that includes other states where congressional maps were redrawn mid-decade. The Missouri Supreme Court’s decision came after Missouri’s Republican-led Legislature approved the new congressional districts in September, shortly after Texas Republicans also redrew their congressional districts, the Associated Press reported.
The redistricting is aimed at changing electoral outcomes, with the new map designed to give Republicans a Kansas City-area seat now held by Democratic U.S. Rep. Emanuel Cleaver. The plan would do so by reassigning portions to two neighboring districts and stretching the remaining lines into more rural, Republican-leaning areas, under the description of the map’s goals.
Opponents of the new plan sought to put the districts to a statewide vote. The legal fight over a referendum advanced as critics submitted more than 300,000 petition signatures to place the map before voters, according to the Associated Press report.
Even with the Supreme Court’s Tuesday ruling, the redistricting could still change through other proceedings. A trial judge had not yet ruled on a separate lawsuit from opponents arguing that the referendum signatures should automatically suspend the new map until a statewide vote can be held during the November election.
With one week remaining before Missouri’s candidate filing deadline, six Republicans had already entered primaries seeking to run against Cleaver under the new districts. The filing posture was described in a declaration from Missouri Attorney General Catherine Hanaway and Secretary of State Denny Hoskins, both Republicans, while a separate trial court challenge that had been rejected on compactness grounds was also being appealed.
The Associated Press report also said the Supreme Court issued two other decisions on election-related issues on Tuesday. The court upheld Missouri’s voter photo identification requirement while finding the plaintiffs lacked legal standing to challenge it, and the court struck down parts of a 2022 voting law that included limits on solicitation of absentee ballot applications and requirements to register to solicit more than 10 voter registration applications—rulings the court said violated constitutional free speech rights.
The Missouri disputes over congressional districts reflect a broader, ongoing push in multiple states to redraw legislative and congressional lines outside the traditional post-census timetable. After Texas and Missouri adopted new U.S. House districts, North Carolina and Ohio also revised their districts in ways that could help Republicans gain seats, while California voters approved new districts in November that could help Democrats win more seats, the Associated Press reported.
It remains unclear whether the accumulating legal and political maneuvering in these states will affect which party controls Congress, as additional court challenges and future election-related measures continue to move through the system.