Supreme Court Blocks Missouri's 2025 House Map for November
The U.S. Supreme Court on Sept. 25, 2026, blocked Missouri from using a 2025 congressional map drawn to add a Republican-leaning U.S. House seat.
The order requires Missouri to hold the November general election under the same congressional districts used in 2022 and 2024. The Court warned that changing maps at this stage would cause "electoral chaos" NPR.
How the map was challenged
A congressional map sets the lines that divide a state into districts. Each district elects one member to the U.S. House, much like school zones assign addresses to a school. A primary picks party nominees. A general election decides who takes office.
Missouri lawmakers passed the blocked map in 2025 at President Trump's behest as part of a strategy to draw more GOP-leaning House seats. Opponents gathered citizen signatures to put the map to a vote on the November 2026 ballot.
The Missouri Supreme Court ruled in September 2026 that the 2025 map never went into effect and was never law because voters had not approved it. The map had still been used in the Aug. 4, 2026, primaries. Secretary of State Denny Hoskins proceeded with the GOP-backed map in those primaries without voter approval.
On Sept. 3, the Missouri Supreme Court unanimously blocked the redrawn map Reuters. Challengers said the redrawn districts could not take effect unless approved by voters in a statewide referendum, a direct vote by all voters in the state AP.
Why the case returned to Washington
The U.S. Supreme Court declined on Sept. 10, 2026, to intervene in the Missouri Supreme Court's ruling but allowed the case to continue. After Republicans sued in federal court, a federal judge and then a federal appeals court backed the GOP-backed map.
That set up a third trip to the U.S. Supreme Court in September 2026 over the same map Reuters. Challengers asked the justices on a Tuesday night to block a decision by the federal appeals court in St. Louis SCOTUSblog. On Sept. 25, the justices ruled against Republican lawmakers and blocked use of the 2025 map in the November general election.
Missouri elections officials had already started mailing some absentee ballots in mid-September 2026 using the old congressional districts. Court filings identify the case as People Not Politicians v. Onder. U.S. Supreme Court filings in the dispute carry docket Nos. 26A-304, 26A-326 and 26A-388 from September 2026.
The broader context here is calendar pressure. A primary run under one set of lines and a general election ordered under another creates separate voter groups for the same cycle. It also leaves federal and state courts issuing conflicting directions while ballots are already in the mail. The Sept. 25 order resolves which lines control in November. It does not resolve the underlying referendum fight over whether the 2025 map can ever become law.
