DETROIT -- 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.

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.

A message was left Tuesday for a UAW spokesman.