read moreRegister now for FREE unlimited access to Reuters.com RegisterLast month, the first General Motors and LG Energy Solution (373220.KS) joint venture Ultium battery plant began production in Lordstown, Ohio.
GM previously expressed support for efforts by the UAW to organize Ultium's battery plants, but did not endorse "card check.
In May, President Joe Biden, in a trip to South Korea, expressed support for workers seeking to unionize joint venture battery plants.
Detroit's Big Three automakers all have battery plants in the works with Korean partners.
Last month, GM and LG Energy said they were considering a site in New Carlisle, Indiana, for a fourth U.S. battery plant.