The Missouri Supreme Court has unanimously blocked newly drawn congressional districts backed by President Donald Trump from being used in the November 2026 general election, dealing a significant blow to Republican redistricting efforts in the state. The court also ordered that Missouri voters get a statewide say on whether the districts should remain in place, adding a direct-democracy dimension to an already high-stakes election law fight.

The ruling is significant not just because of its political consequences, but because it underscores how state supreme courts continue to play a central role in policing redistricting disputes.

The Missouri Supreme Court has unanimously blocked the state’s newly enacted congressional map from taking effect in the November 2026 general election, holding that a referendum petition challenging the measure was both valid and timely. The practical result is significant: unless Missouri voters approve the new map, the state will continue using the prior post-2020 census congressional boundaries.

The dispute centered on whether opponents of the map had properly invoked Missouri’s referendum process to suspend the law before it could be implemented.

Louisiana Gov. Jeff Landry has suspended the state’s May 16 congressional primary following the U.S. Supreme Court’s April 29 action involving the state’s congressional map, setting off immediate consequences for election administration and renewed urgency in the underlying redistricting fight.

The move underscores a recurring reality in voting-rights litigation: court rulings do not stay confined to briefing schedules and appellate dockets.

In one of the most consequential election-law rulings of the term, the Supreme Court on April 29 struck down Louisiana’s congressional map, holding that the state’s SB8 plan was an unconstitutional racial gerrymander. The Court concluded that the Voting Rights Act did not require Louisiana to create an additional majority-minority district, and without that predicate, the state could not rely on compliance with federal voting-rights law as a compelling interest to justify race-based line drawing.

The decision in Louisiana, Appellant v. Phillip Callais, et al. immediately reshapes the legal landscape for redistricting disputes.