United Auto Workers President Shawn Fain on Thursday night said the union will strike all the Big Three automakers – GM, Ford and Stellantis – at the same time as of midnight if the companies do not reach tentative labor deals with the auto workers.

“Tonight for the first time in our history we will strike all three of the big three at once,” Fain said in a Facebook live transmission. He identified three assembly plants for targeted strikes: a GM plant in Wentzville, Missouri; a Stellantis plant in Toledo; and a Ford plant in Wayne, Michigan.

Even with only three local unions on strike, though, production could still grind to a halt at General Motors, Ford and Stellantis, which builds vehicles under the Jeep, Ram, Dodge and Chrysler brands for North America.