The Missouri Supreme Court ruled Thursday that the state can't use redrawn congressional districts that benefited Republicans in November's midterm elections, and voters must decide if they should be used in future elections.

The unanimous decision was a blow to Republicans who were hoping to gain one U.S. House seat with the redrawn map in the midterms. Around the country, both parties have been changing congressional maps hoping to gain an advantage in the House.

Missouri's new congressional map "did not go into effect and will not go into effect unless and until approved by the voters," Judge Ginger K. Gooch wrote in Thursday's opinion. She said that state voters can decide in November if the map can be used in the future.

Until then, a previous map created in 2022 "remains in full force and effect for the November 2026 general election."

Missouri Gov. Mike Kehoe, a Republican, had pushed lawmakers to redraw the state's maps last year after pressure from President Trump.

"We are extremely disappointed in today's decision by unelected judges and their lack of respect for the legislative process," Kehoe said Thursday, pointing out that the new map was used in the recent primaries. "Holding a primary election under one congressional map and a general election under another is unprecedented and creates uncertainty for Missouri voters."

Trump also blasted the ruling.

"The Missouri Supreme Court just ridiculously ruled in favor of changing the maps back to what they were a long time ago," he said on Truth Social. He said that there won't be enough time to change the map with the election coming up in a short period.

"Missouri must be able to use the map that was in effect just a couple of months ago, in the Primary," he added.