Missouri’s Supreme Court is set to hear oral arguments on the state’s new congressional map on Tuesday as Democrats try to slow down the Republican Party’s recent redistricting wins.

The Missouri high court is hearing three cases on the GOP-friendly map, which seeks to redraw one of the Democrats’ two seats in the state’s House delegation. The district under fire is represented by Rep. Emanuel Cleaver (D-MO), who serves constituents in a portion of Kansas City.