The Missouri Supreme Court on Thursday blocked a Republican-backed congressional map from taking effect in Novembers midterm elections, potentially preserving Democratic Representative Emanuel Cleavers Kansas City-area seat. The unanimous ruling requires voters to approve the map in a referendum, dealing a setback to Republicans seeking to protect their narrow House majority.

The Missouri Supreme Court has blocked a new U.S. House map backed by President Donald Trump from being used in the November election

President Donald Trump had hoped the map would be used in the November election.

The unanimous decision means Missouri will use its previous congressional map, drawn after the 2020 census, for the 2026 midterm elections.