The governor of Missouri signed into law on Sunday a new congressional map that Republicans hope will help them win an additional House seat in next year’s midterm elections.

The Republicans’ push, which came outside the usual once-a-decade cycle for redrawing congressional maps and at the urging of President Trump, splices the Democratic-leaning core of Kansas City into districts with large, heavily Republican rural areas. The new map threatens the re-election chances of Representative Emanuel Cleaver, a Democrat who has spent 20 years in Congress and was the first Black mayor of Kansas City.

Republicans hold supermajorities in both chambers of the Missouri General Assembly, and Gov. Mike Kehoe, a Republican, had been expected to sign the measure.

What Does This Mean for Congress?

If the new map takes effect, it is expected to make it easier for Republicans to win seven of Missouri’s eight seats in the U.S. House. Under the current map, Republicans hold six seats and Democrats hold two.

With midterm elections looming and Mr. Trump’s party holding a small majority in Congress, the president and his allies have leaned on Republican-led states to redraw maps to help conservative congressional candidates next year.