Michigan Compiled Laws, Chapter 32. Military Establishment § 32.551

Sec. 151.(1) The governor is the commander-in-chief of the Michigan National Guard. He or she may order to active state service any members of the Michigan National Guard in case of riot, tumult, breach of the peace, or resistance of process, or for service in aid of civil authority, whether state or federal, or in time of actual or imminent public danger, disaster, crisis, catastrophe, or other public emergency within this state or to respond to acts or threats of terrorism or to safeguard military or other vital resources of this state or of the United States. If the governor and his or her legal successor are absent or disabled or cannot be communicated with, the adjutant general, if he or she believes the danger great and imminent, may order out, in the name of the governor, such troops of the Michigan National Guard as he or she believes necessary to meet the emergency.

(2) In circumstances other than those described in subsection (1), the governor may order any member of the Michigan National Guard to active state service for duties in support of the full-time operation of the Michigan National Guard. However, a member of the Michigan National Guard who is called to active service under this subsection does not have any police powers or arrest authority.