Michigan Compiled Laws, Chapter 550. General Insurance Laws § 550.4

Sec. 4. The said commissioner is hereby authorized and empowered to put into effect, and to enforce as against any foreign insurance company doing business in this state, any rule or regulation made applicable to any Michigan corporation or society doing an insurance business in the domestic state of such foreign company, during the period of any emergency covered by the provisions of this act. This section shall be in addition to, and not in limitation of, any law of this state requiring or permitting reciprocal application of the laws of this state to foreign insurance companies doing business in Michigan or requiring equal privileges to be extended to Michigan companies operating in other states.