BATON ROUGE, La. (AP) — Thousands of Louisiana voters have already cast early ballots for congressional candidates in what soon could be the wrong districts. Alabama’s primaries are a week away, but the state could force a do-over for voting on U.S. House races. A new congressional map in Tennessee upended races that had been underway for months.

Republicans’ rush to gerrymander congressional districts across several Southern states after a U.S. Supreme Court ruling hollowed out the Voting Rights Act is confusing voters and creating logistical headaches for local election officials. The changes are hitting while primary season is in progress.

The chaotic upheaval to an election season that could determine which party controls the U.S. House is the latest fallout from an intensely partisan gerrymandering battle initiated by President Donald Trump last year to protect Republicans’ slim majority.

The Supreme Court’s decision last month severely weakening the Voting Rights Act required Louisiana to reconsider a map drawn in 2024 with two majority minority congressional districts that elected Black representatives. The GOP-controlled Legislature could eliminate one or both in a state where roughly 30% of the population is Black.

The ruling also encouraged Republicans in Alabama, Mississippi, South Carolina and Tennessee to consider eliminating four Democratic districts among them, three represented by Black lawmakers. Florida has a new map meant to cost Democrats four of their eight seats, out of 28.

In Louisiana, 66-year-old New Orleans resident Sallie Davis voted early last week. Her ballot allowed her to vote for Democratic U.S. Rep. Troy Carter, but a sign at her polling booth showed his race crossed off with a ballpoint pen. She was confused and frustrated — especially when a poll worker told her to go with what the sign seemed to convey. She’s now worried that her entire ballot will not be counted.

“I was supposed to believe a piece of paper with an X on it marking out the person I wanted to vote for,” she said, her voice breaking as she recounted her experience later. “I think I have been disenfranchised. I think my vote, that I just voted on, it’s not going to count or something. I think it’s illegal.”

Louisiana’s primary is Saturday, and a week of early voting there began May 2, two days after Republican Gov. Jeff Landry declared an emergency and suspended congressional primaries to give lawmakers a chance to draw a new map.

The Louisiana secretary of state’s office said nearly 179,000 primary ballots had been cast as of Friday, including about 53,000 absentee ballots returned by mail.