The Michigan Republican Party has filed a complaint with the state over Governor Gretchen Whitmer's re-election campaign paying for her use of a private jet to visit her ailing father in Florida.
The law lets elected officials use political funds for incidental expenses incurred while carrying out government work.
Republican party leaders say the trip was personal and not for official business.
Democrats call the complaint "bogus." Secretary of State Jocelyn Benson could levy a fine if she finds a violation.