The U.S. Justice Department wants a panel of judges in Washington to strike down a South Carolina voter identification law that the federal government said will hurt the ability of minorities to vote.

The special three-judge panel on September 24 heard closing argument in South Carolina’s suit against the Justice Department in U.S. District Court for the District of Columbia. The court is assessing whether South Carolina’s voter identification requirements run afoul of the Voting Rights Act in the law’s effect and in its purpose.