Wis. Stat. § 66.0512

No municipal clerk, as defined in s. 5.02 (10), county clerk, as defined in s. 5.02 (2), or election official, as defined in s. 5.02 (4e), may be discharged, disciplined, demoted, or otherwise discriminated against in regard to employment, or threatened with any such treatment, as a reprisal because the clerk or election official lawfully reported, or is believed to have reported, witnessing what the clerk or election official reasonably believed to be election fraud or irregularities. For purposes of this section, “lawfully reported” means a report of information the disclosure of which is not expressly prohibited by state or federal law, rule, or regulation.