The main purpose of this legislation is to remove the expiration date, known as the "sunset provision," from the Iran Sanctions Act of 1996. The sunset provision originally set a time limit on how long certain sanctions against Iran would remain in effect. By repealing this provision, the bill aims to ensure that sanctions against Iran continue indefinitely as a measure to address concerns over its weapons programs and support for terrorism. Key provisions of the bill include a clear statement of U.S. policy to fully enforce the Iran Sanctions Act.