The requirements of this chapter relative to disclosure of contributions shall apply to candidates and political committees for federal office only in the event such candidates are not subject to a federal law requiring the disclosure of campaign financing. Any such federal law shall supersede the provisions of this chapter . [C75, 77, 79, 81, §56.17 ] 2003 Acts, ch 40, §9 CS2003, §68A.103 2017 Acts, ch 144, §3, 14