The automaker has rolled back commitments the union says it won in last year's collective bargaining agreement.

More than a year has passed since the contract deadline for the local agreement between the Dearborn automaker and the unit of more than 500 workers.

The United Auto Workers union is eying multiple U.S. strikes against French-Italian carmaker Stellantis about a year after a national walkout cost the Detroit Three automakers billions of dollars and idled 50,