The Missouri Supreme Court blocked new congressional districts backed by President Donald Trump from being used in the November election and ordered a statewide vote on whether to uphold or reject the new map. ^[1] Opponents submitted over 300,000 petition signatures in December seeking to put the map to a vote of the people, but Republican Secretary of State Denny Hoskins waited until primary election day in August to reject the petition. ^[2] The decision marks a rare setback for Republicans in a national redistricting battle, as Republicans had hoped Missouri’s new congressional boundaries could help them win an additional seat and hold onto their slim House majority in the midterms. ^[3] The Missouri Supreme Court ruled that a constitutional provision allowing a referendum on any act of the Legislature encompasses congressional redistricting, despite the constitution not specifically saying a referendum petition can be used for a congressional redistricting law. ^[4] The court ruled that a citizen petition for a referendum was legal, sufficient, and timely, overturning the decision of Republican Secretary of State Denny Hoskins. ^[5] The original congressional map adopted after the 2020 census remains in full force and effect for the November 2026 general election. ^[6]