Justice Brett Kavanaugh denied the emergency appeal by Republicans seeking to preserve a GOP-friendly redrawn congressional district map for the November election.
Tuesday marks 56 days until the midterm elections, where the balance of power of the U. S. Congress hangs in the balance.
It's a defeat for Republicans who had hoped the new map could help them hold on to their slim House majority.
Republicans are gathering in Dallas, Texas, ahead of their first-ever midterm convention that kicks off Wednesday. CBS News senior White House and political correspondent Ed O'Keefe reports.
Missouri’s Supreme Court blocked election officials from using a new congressional map, saying voters must first approve the district lines in a statewide referendum.
President Trump and top GOP leaders are gathering in Dallas for a midterm convention, though some Republicans in competitive races are opting to skip it and campaign in their home districts or states.