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The union on Sept. 22 expanded its strikes against GM and Stellantis, but kept its Ford walkout limited to a single plant.
The union historically has picked one of the Detroit Three to negotiate with first as the so-called target that sets the pattern on which subsequent deals are based.
Long walkouts at factories producing large pickup trucks could cost the automakers billions in revenue and profit.
Analysts estimate GM, Ford and Stellantis earn as much as $15,000 per vehicle on each of their respective large pickup models.
President Joe Biden on Tuesday joined a picket line with striking autoworkers in Michigan, supporting their call for a 40% pay raise and saying they deserve a "lot more" than they are getting.
Former President Donald Trump, the Republican front-runner for the 2024 nomination, will speak to workers in Michigan on Wednesday at a non-union auto manufacturer.
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