A Utah Supreme Court justice has resigned amid a probe into an alleged relationship with an attorney who worked on a redistricting lawsuit.

The Virginia Supreme Court on Friday struck down a voter-approved Democratic congressional redistricting plan, delivering another major setback to the party in a nationwide battle against Republicans for an edge in this year's midterm elections.

Six months later, much of that momentum had evaporated.

The ruling was a major lift to the G.O.P. efforts to build a structural advantage through redistricting.