Iowa Code § 44.13: Certificates in matter of vacancies.

The certificates of nominations made to fill such vacancies shall state, in addition to the facts and candidate’s affidavit required in an original certificate, the name of the original nominee, the date of death or declination of nomination, or the fact that the former nomination has been held insufficient or inoperative, and the measures taken in accordance with the above requirements for filling a vacancy, and shall be signed and sworn to by the presiding officer and secretary of the convention, or caucus, or by the chairperson and secretary of the committee, as the case may be.