Battleground states have already seen their share of fights before Election Day as legal challenges centered on voting issues, and while some have already been decided, others remain up in the air just hours before polls open Tuesday morning.

From issues including mail-in ballots, drop boxes and concerns about ineligible voters, here are some of the high-profile swing state cases and where they currently stand.

Arizona

Arizona Secretary of State Adrian Fontes acknowledged in September that 218,000 people in the state were allowed to register to vote without proof of citizenship despite state law that requires it. A state court set a deadline of Monday for production of a full list of affected people so that the recorders of each county can verify the citizenship of voters who had not previously provided proof of citizenship.

The Maricopa County Recorder’s Office said in a statement to Fox News Digital on Monday before receiving any list that approximately 2,000 people had tried to submit voter registration updates and subsequently received notices that they had to prove their citizenship.