In case of the removal, death, or resignation of the governor, the lieutenant governor shall become governor and the president of the senate shall become lieutenant governor. If the offices of governor and lieutenant governor are both vacant, the president of the senate shall become acting governor and the speaker of the house shall become acting lieutenant governor. An acting governor or lieutenant governor who assumes office when more than one year remains in the term may serve only until a governor or lieutenant governor is chosen in a special election provided by law.