The automaker is taking legal action against the union's threat to walk off over delayed investments in some of Stellantis' assembly plants, including the shuttered Belvidere site.

Chrysler parent Stellantis STLAM.MI filed a federal lawsuit against the United Auto Workers, saying the union has violated its contract by threatening to strike over the company’s delays in planned investment.

A UAW local in southern California was the first to authorize a mid-contract strike against the company. It swiftly prompted a lawsuit.