WASHINGTON — The Supreme Court will hear an appeal by Virginia Republicans who are trying to preserve state legislative districts that have been struck down by a lower court as racially discriminatory.

The court’s action Tuesday comes in a case involving 11 districts in the Virginia House of Delegates. Democratic voters accused majority Republicans of packing black voters into certain districts to make surrounding districts whiter and more Republican.

A three-judge federal court in Virginia ruled 2-1 in June in favor of the Democratic voters and has appointed a redistricting expert to draw a new legislative map.

The Supreme Court already has ruled once in the case. Last year, the justices voted 7-1 to throw out an earlier ruling that had upheld the challenged districts.

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