Democrats have filed an emergency appeal to the U.S. Supreme Court seeking to halt a redistricting rule by Virginia's top court. The state court had invalidated a ballot measure that would have given Virginia Democrats an additional four winnable U.S. House seats. Virginia voters narrowly approved a constitutional amendment last month that let Democrats redraw political lines in time for the November elections. That move was in response to mid-decade redistricting in Republican states pressured by President Donald Trump. The appeal is a long shot because the Supreme Court tries to avoid second-guessing how state courts interpret their state constitutions.

Alabama lawmakers have approved a plan for new U.S. House primaries if courts allow the state to use different congressional districts in this year's elections. Republican Gov. Kay Ivey signed the measure into law Friday shortly after the legislature approved it. The action came on the same day that the Virginia Supreme Court dealt a major setback to Democrats by overturning a redistricting plan that could have helped Democrats win as many as four additional House seats. The Alabama bill could set aside the results of the May 19 primaries, if courts lift an injunction requiring it to use a map with two districts that have large Black populations.

Tennessee has enacted a new U.S. House map that carves up a majority-Black district in Memphis. The new voting districts signed into law Thursday by Republican Gov. Bill Lee gives the GOP a chance to win all nine of the state's congressional seats in the November midterm elections. Tennessee is the first state to adopt new districts since a U.S. Supreme Court ruling last week that undermined a key provision of the Voting Rights Act. President Donald Trump has urged more Republican-led states to redraw their districts in light of the court ruling. Louisiana, Alabama and South Carolina also have taken steps toward redistricting.