Missouri Gov. Mike Kehoe has signed a new congressional map into law that gives Republicans an improved shot at winning an additional U.S. House seat

FILE - The Missouri State Capitol building is seen Sept. 11, 2024 in Jefferson City, Mo. (AP Photo/Ed Zurga, File)

JEFFERSON CITY, Mo. (AP) — Missouri Gov. Mike Kehoe signed a new U.S. House map into law Sunday as part of President Donald Trump’s plan to try to hold on to a narrow Republican majority in next year’s congressional election.

Kehoe’s signature puts the revised districts into state law with a goal of helping Republicans win one additional seat. But it may not be the final action. Opponents are pursuing a referendum petition that, if successful, would force a statewide vote on the new map. They also have brought several lawsuits against it.

U.S. House districts were redrawn across the country after the 2020 census to account for population changes. But Missouri is the third state this year to try to redraw its districts for partisan advantage, a process known as gerrymandering.

Republican lawmakers in Texas passed a new U.S. House map last month aimed at helping their party win five additional seats. Democratic lawmakers in California countered with their own redistricting plan aimed at winning five more seats, though it still needs voter approval. Other states also are considering redistricting.

Each seat could be critical, because Democrats need to gain just three seats to win control of the House, which would allow them to obstruct Trump’s agenda and launch investigations into him. Trump is trying to stave off a historic trend in which the president’s party typically loses seats in midterm elections.

Republicans currently hold six of Missouri’s eight U.S. House seats. The new map targets a seat held by Democratic U.S. Rep. Emanuel Cleaver by shaving off portions of his Kansas City district and stretching the rest of it into Republican-heavy rural areas. It reduces the number of Black and minority residents in Cleaver’s district, which he has represented for two decades after serving as Kansas City’s first Black mayor.

Cleaver has denounced the redistricting plan for using Kansas City’s Troost Avenue — a street that has long segregated Black and white residents — as one of the dividing lines for the new districts.

Kehoe has defended the new map as a means of boosting Missouri’s “conservative, common-sense values” in the nation’s capital.

Opponents are gathering petition signatures seeking to force a statewide referendum on the new map. They have until Dec. 11 to submit around 110,000 valid signatures, which would put the map on hold until a public vote can occur sometime next year.

Meanwhile, opponents also are pursuing a variety of legal challenges. Lawsuits by voters contend mid-decade redistricting isn’t allowed under Missouri’s constitution. A lawsuit by the NAACP contends no “extraordinary occasion” existed for Kehoe to call lawmakers into session for redistricting.

A lawsuit by the American Civil Liberties Union also asserts that the new Kansas City area districts violate state constitutional requirements to be compact and contain equal populations. It notes that the redistricting legislation lists a “KC 811” voting precinct in both the fourth and fifth congressional districts, which it asserts is grounds to invalidate the new map.

But Kehoe’s office said there is no error. It said other government agencies had assigned the same name to two distinct voting locations.