Republican governors in Tennessee and Alabama have called special legislative sessions to begin considering redrawing congressional maps following a recent Supreme Court ruling that narrowed parts of the Voting Rights Act.

In Tennessee, Gov. Bill Lee is pushing for an expedited effort that could reshape districts, including potentially dividing the state’s only Democratic seat to favor Republicans.

In Alabama, Gov. Kay Ivey is preparing for possible court-driven changes that could alter the state’s House map ahead of upcoming elections.

The legal and political uncertainty stems from a Supreme Court decision that weakened requirements for drawing majority-minority districts, prompting several states to revisit their maps, CBS News has reported.

Across the South, multiple states are now exploring mid-decade redistricting that could significantly impact control of U.S. House seats.