Lisa Tate is a sixth-generation farmer in Ventura County, California, an area that produces billions of dollars worth of fruit and vegetables each year, much of it hand-picked by immigrants in the U.S. illegally. Tate knows the farms around her well. "In the fields, I would say 70% of the workers are gone," she said in an interview. "If 70% of your workforce doesn't show up, 70% of your crop doesn't get picked and can go bad in one day. I fear this has created a tipping point where many will go bust."