A ruling on Tennessee's voter ID law could come as early as next week.
The city of Memphis filed a lawsuit after the state decided city library cards were not considered valid picture IDs.
New state law requires voters to show a valid state or federal ID to cast a ballot. A court of appeals will decide if the law is valid, and whether library cards are acceptable.
Opponents believe the law would prevent the poor and elderly from voting.
"We shouldn't be making it more difficult (to vote), we should be making it more easy," said Herman Morris, Memphis city attorney.
"There is just no evidence in this record that this condition the requirement of a photo ID for these plaintiffs is oppressive or impossible," said Janet Kleinfelter, state attorney.
It normally takes the Court of Appeals weeks, or even months to make a decision, but with the election approaching, a decision is expected next week.