Of the Amendments, the 31st was the most controversial. The Democratic Party claimed that the lack of definition of what constitutes "proper identification" could be employed to deny voter registration to those not in concurrence with the administration's aims. These concerns led to the Feinstein v. State of Alabama Supreme Court Case in 2023, in which the Supreme Court defined "proper identification" as any document, including a birth certificate and photo IDs, which proved the person to be who they claimed to be.