The Supreme Court is poised to resolve the dispute before the November election.
The Illinois State Board of Elections said it is "reviewing" a letter from the U.S. Department of Justice threatening criminal prosecution of any official who allows noncitizens to cast ballots and requesting information about how the state intends to prevent noncitizens voting.
The U.S. Supreme Court has ruled that states can continue to set their own rules for counting mail-in ballots, rejecting a challenge backed by President Donald Trump ahead of the midterm elections.
A federal judge Thursday morning blocked part of President Donald Trump's executive order on mail-in voting.
Republican Steve Hilton will advance to the November general election and face Democrat Xavier Becerra in the California governor's race.
With the polls closed, all eyes are on the California governor's race.