A federal judge on Thursday sided with the Georgia NAACP against the state of Georgia to extend voter registration for the June 20 run-off election for the U.S. House seat vacated by Health and Human Services Secretary Tom Price.

U.S. District Judge Timothy Batten's decision, following a hearing, will defy a Georgia law which allowed only those people eligible to vote in the April 18 special election to vote in the runoff. Now Georgia residents can register through May 21.

On the Georgia NAACP's side of the case, it was argued that Georgia law violated the National Voter Registration Act of 1993. The state pushed back, arguing that "[v]oter qualifications in elections are left to the states," and that the run-off is a continuation of the general election.

The June 20 run-off, which is happening because no single candidate reached the 50-percent threshold in the mid-April special election, will feature a matchup between Democrat Jon Ossoff and Republican Karen Handel for the Sixth Congressional District.