As the United Auto Workers strike enters its fifth week, the UAW president says strike expansions could occur any day of the week, not just on Fridays, as they have been in the past.
Jon Faine also says no one else is joining the strike today.
On Wednesday, 8700 workers at Ford's Kentucky truck plant walked off the job.
It's Ford's biggest factory and its most profitable.
Ford says the pickup trucks and SUVs made their produce $25 billion in annual sales.