The Missouri House is expected to approve a new congressional map Tuesday that would 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.

On Monday night, lawmakers in the chamber cast a preliminary vote approving the new district lines, although several Republicans joined Democrats in voting against the plan. Even so, final passage in the GOP-controlled state legislature is expected by week’s end, putting Missouri on track to become the third state in recent weeks to press ahead on new House maps as part of a national battle over redistricting.

President Donald Trump’s allies are hunting for opportunities to add more Republican-friendly districts in several

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