The Supreme Court has upheld West Virginia's congressional redistricting plan against a challenge that small population variations among its three congressional districts violate the Constitution.

The justices on Tuesday, in an unsigned opinion, reversed a lower federal court ruling that struck down the plan because of the population differences.

The high court said the West Virginia plan easily passes muster and said the population variations are too small to trigger constitutional concerns about the principle of one person, one vote.

The justices had previously blocked the ruling to allow the state to conduct elections under the congressional map that the West Virginia legislature adopted last year.

The lower court still can consider challenges to the plan under the state Constitution.