A judge extended Arizona’s voter registration deadline by three weeks, in a case that could land in the Supreme Court.

Mere hours before the midnight cutoff for Arizona voters to register for the November election, a federal district court judge extended the deadline by nearly three weeks, saying that thousands of people weren’t able to register because of the pandemic.

The Monday night ruling means that voters will have until Oct. 23 to register to vote. But lawyers for the Republican National Committee and Republican National Senatorial Committee immediately filed an appeal.

The question could go to the Supreme Court in the coming weeks.

Arizona is a battleground in the presidential election, with Joseph R. Biden Jr. threatening to flip a state Donald J. Trump won in 2016 and Senator Martha McSally, an appointee who filled John McCain’s seat, trailing in the polls to a Democratic challenger.

The lawsuit, brought by the Latino voter advocacy group Mi Familia Vota, argued that Gov. Doug Ducey’s stay-at-home order interrupted voter registration drives and that the pandemic stunted the group’s ability to sign people up to vote even after the order was lifted in May.