The decision appears to clear the way for use of the old maps.
It comes after a pitched court battle shortly before ballots begin going out for the pivotal November elections. The maps were drawn to help Republicans gain an additional U.S. House seat.
It’s the second time the high court has refused to intervene to keep the Trump-backed maps in place.
Missouri was the second Republican-led state, after Texas, to enact new districts after Trump urged Republicans last year to redraw House districts to their advantage ahead of the midterm elections.
The revised Missouri districts target a Kansas City-based seat held by Democratic Rep. Emanuel Cleaver by shedding parts into neighboring districts and stretching the remainder into rural Republican areas. The goal is to help Republicans win seven of the state’s eight House seats in the midterm elections — a gain of one seat.
