UAW President Shawn Fain said Friday 7,000 workers will walk out at a Ford facility in Chicago and a GM plant in Lansing, Mich., again expanding its strike against the auto makers.

The union spared Stellantis, with Fain citing some progress in talks.

The strike expansion will add further pressure on the car companies and comes days after both President Joe Biden and his predecessor, Donald Trump, traveled to Michigan to court the support of blue-collar workers, a key political constituency ahead of the 2024 elections.

“Without the strike weapon, the war on workers is a rigged fight,” Fain said Friday.