The main purpose of this legislation is to prevent the federal government from creating or keeping a database that collects or helps verify the identities of U.S. citizens using biometric data. Biometric data refers to unique physical or behavioral traits, such as fingerprints, iris patterns, or facial features, that can be used to identify individuals. The key provision of this legislation is a clear prohibition against any federal agency establishing or maintaining a database that involves biometric identity verification of U.S. citizens.