The United Auto Workers union is threatening to go on strike against Fiat Chrysler.
The company says in a statement Tuesday that it received a strike notice from the union and it continues to work toward reaching an agreement.
A letter to Fiat Chrysler that was posted on the UAW website says the union is terminating its contract with FCA at 11:59 p.m. Wednesday.
More from Brent Snavely and Alissa Priddle of the Detroit Free Press:
A national walkout or strike would threaten to quickly destabilize Fiat Chrysler, which has been profitable in recent years, but is the weakest company of the Detroit Three. It also could do tremendous damage to the relationship between the union and the company that has markedly improved in recent years compared with prior decades.
Union members overwhelmingly rejected a tentative contract agreement with the company last week. Union leadership said they would go back to the bargaining table.
The union's four-year contract with FCA expired on Sept. 14 but workers have remained on the job under a contract extension.
*We will have more on this story as it develops.