The Wisconsin Supreme Court on Monday agreed to hear a case seeking to purge about 129,000 voter registrations from the rolls ahead of the November presidential election after previously deadlocking on whether to get involved.

Democrats oppose the voter purge, arguing it is intended to make it more difficult for their voters to cast ballots. Conservatives who brought the lawsuit argue that the integrity of the vote is at stake, saying that when records indicate voters may have moved, their registrations should be deactivated.

The case is closely watched in battleground Wisconsin, a state President Donald Trump won by fewer than 23,000 votes in 2016. Winning Wisconsin is a key part of the strategy for both Trump and presumptive Democratic nominee Joe Biden.

he voter purge case was brought on behalf of three voters by the Wisconsin Institute for Law and Liberty, a conservative law firm. It won in Ozaukee County, with a judge ordering in January that the purge take place immediately. The Supreme Court deadlocked then when asked to immediately take the case. In February, a state appeals court reversed the lower court’s ruling, stopped the purge and dismissed the case.

That set up the latest request made in March for the Supreme Court to hear the case, which it agreed to do on Monday. It is likely to hear arguments this summer or early fall and could issue a ruling before the November election.