Missouri’s House of Representatives on Tuesday approved a new congressional map that will likely give Republicans an additional U.S. House seat in next year’s midterm elections, expanding President Donald Trump’s unprecedented effort to redraw congressional lines in the middle of the decade.

The “Missouri First” map, which passed solely with Republican votes, breaks up a Democratic-held district in Kansas City and gives Republicans an advantage in seven of the state’s eight U.S. House of Representatives districts. The 11-term incumbent in Kansas City, U.S. Representative Emanuel Cleaver, has vowed to challenge the map in court.

The Republican-dominated Missouri Senate is expected to approve the map next week, sending it to Republican Governor Mike Kehoe for his signature.

The vote marks

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