Wisconsin Constitution Art. V § 8. Secretary of state, when governor

Section 8. (1) If, there is a vacancy in the office of lieutenant governor and the governor dies, resigns or is removed from office, the secretary of state shall become governor for the balance of the unexpired term.

(2) If there is a vacancy in the office of lieutenant governor and the governor is absent from this state, impeached, or from mental or physical disease becomes incapable of performing the duties of the office, the secretary of state shall serve as acting governor for the balance of the unexpired term or until the governor returns, the disability ceases or the impeachment is vacated.