The Missouri House voted Tuesday to approve a new congressional map that seeks to eliminate a Democratic-controlled US House seat, as Republicans around the country scramble to boost their chances of retaining control of Congress after next year’s midterm elections.

The so-called “Missouri First Map” would split Kansas City into three GOP-leaning congressional districts and could help Republicans flip Rep. Emanuel Cleaver’s (D-Mo.) seat next year.

The plan would probably give Republicans one more U.S. House seat. It heads to the state Senate, where it is expected to pass and win the governor’s signature.