Iowa Code § 61.11: Subpoenas — depositions.

The secretary of state, the several clerks of the supreme and district courts, under their respective seals of office, and either of the judges of the supreme or district courts, under their hands, may issue subpoenas for witnesses to attend this court; and disobedience to such process may be treated as a contempt. Depositions may also be taken as in the case of contested county elections.