Missouri Supreme Court blocks the 2025 House map for November and sends it to a referendum

The Missouri Supreme Court ruled unanimously on 3 September that the congressional map the Republican legislature passed in 2025 cannot be used in the 3 November general election. Judge Ginger K. Gooch wrote that a referendum petition filed in December with more than 300,000 signatures was legal, sufficient and timely. House Bill 1 therefore never took effect. The districts drawn after the 2020 census remain the map for November.

The court also ordered Secretary of State Denny Hoskins to certify the petition for the November ballot and barred him from implementing the 2025 lines unless voters first approve them. If they do, the new map would take effect 30 days after the election, too late for this cycle. It is the first time since 1922 that Missourians will vote on a congressional plan.

The practical effect is one House seat. The 2025 map was drawn to move the state's delegation from a 6-2 Republican edge to 7-1 by recasting the Kansas City district held by Democrat Emanuel Cleaver. That district now reverts to its 2022 shape for the general election. Candidates already ran in the August primary under the new lines. Administrators now have to run the general under the old ones.

Hoskins had refused to certify the petition, arguing it was barred by state and federal law. A circuit court agreed with him. The Supreme Court reversed. "The secretary incorrectly concluded otherwise," Gooch wrote. Governor Mike Kehoe, who had proposed the map to lawmakers, called the ruling an unprecedented violation of federal law. Attorney General Andrew Bailey's office, which represented Hoskins, used the same phrase.

President Donald Trump attacked the decision after it landed. Republicans had counted the extra Missouri seat as one of the midterm gains available from mid-decade redraws in several states. Democrats now keep a district they were prepared to lose. Voters will still decide whether the 2025 lines exist after November. That vote does not change who sits in the next Congress from Missouri.

The timing is tight. The court spoke five days before the deadline to add measures to the November ballot. North Carolina and Alabama were already preparing to mail ballots under other fights. Missouri's problem is home-grown: a primary under one map and a general under another. County clerks have days, not months, to reset precinct files, ballot styles and voter notices.

Missouri's constitution lets citizens refer most statutes to a vote if they gather enough signatures before the law takes effect. The court said that power covers redistricting. That reading is what turned a legislative map into a ballot question. It is also why Hoskins's office called the outcome a collision with federal election law, which assigns congressional districting to state legislatures subject to the Constitution and the Voting Rights Act, not to a later popular veto.

For Cleaver, the ruling restores the Kansas City-based district he has held. For the Republican who won the primary in the redrawn version of that seat, the general election now occurs in a different geography. Campaign money already spent on the new lines does not transfer cleanly. The Associated Press and state outlets noted that both parties have been redrawing maps this cycle. Missouri is the case where a state court stopped one of those maps after the primary had already used it.

The opinion does not say the 2025 map is unconstitutional. It says the map never became law because the referendum process attached first. That is a narrower holding than a gerrymandering ruling, and it leaves the policy fight to the November electorate. If voters reject HB 1, the 2022 lines remain. If they approve it, the 7-1 design takes effect for later elections, beginning with 2028 unless the legislature acts again.

Gooch's order is explicit about Hoskins and anyone acting with him: they are restrained from using the 2025 plan for November "or at any other time thereafter unless and until" voters approve it. That sentence is the operational instruction for every local election authority in the state.