Kansas is asking a federal appeals court to keep thousands of people who haven’t yet provided the documents to prove they are U.S. citizens from voting in November’s election. Judges from the 10th U.S. Circuit Court of Appeals in Denver are set to hear arguments Tuesday in the legal fight over how the state enforces its proof-of-citizenship requirement for voters who register at motor vehicle offices. Since 1993, states must allow people to register to vote when they apply for or renew their driver’s licenses. The so-called motor-voter law says that people can only be asked for “minimal information” when registering to vote, allowing them to simply affirm they are citizens.