The Supreme Court is hearing arguments in a case involving Rep. Nancy Mace’s (R-SC) South Carolina district regarding the state’s Republican-drawn electoral map that critics say is discriminatory toward black voters.

The redistricting plan has been years in the making, with the Republican-led legislature approving the map in 2022, which led to the NAACP suing state Republicans.

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In January, federal judges ordered South Carolina lawmakers to redraw the congressional map, ruling the coastal 1st District as an unconstitutional racial gerrymander, diminishing black voters' influence under the Constitution's 14th and 15th amendments.

The panel of three federal judges ruled lawmakers deliberately moved 30,000 black residents from Charleston County away from the district to reduce its black population to a “target” of 17%.

South Carolina Republicans appealed this decision to the Supreme Court, arguing it's about partisan politics, not race.

In the past, the Supreme Court has said partisan gerrymandering is not subject to review by the courts, but state’s drawing district lines only based on race is unconstitutional.

“Using race as the predominant means to sort voters is unconstitutional even if done for partisan goals,” attorneys for the NAACP wrote.

In a brief filed by GOP lawmakers, they detail why the Supreme Court should overturn the lower court’s ruling, saying the map is “substantially similar” to one that has constitutional approval, writing, “there is no reason to disturb that ruling now.”

Rep. Jim Clyburn (D-SC) filed a separate brief, asking the Supreme Court to uphold the lower court’s decision, noting the map “constitutes a 'stark racial gerrymander,'” and the legislature designed the boundaries of the district with “racially discriminatory intent.”

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Depending on the outcome of the case, it could give Democrats a chance at winning a congressional seat. In 2020, Mace became the first Republican woman elected to the House from South Carolina, flipping the district from blue to red by narrowly defeating former Democratic Rep. Joe Cunningham.

The highest court will hear arguments on Wednesday morning in the case titled Alexander v. South Carolina NAACP.