U.S. farm industry groups want President-elect Donald Trump to spare their sector from his promise of mass deportations, which could upend a food supply chain heavily dependent on immigrants in the United States illegally.

So far Trump officials have not committed to any exemptions, according to interviews with farm and worker groups and Trump’s incoming “border czar” Tom Homan.

Nearly half of the nation’s approximately 2 million farm workers lack legal status, according to the departments of Labor and Agriculture, as well as many dairy and meatpacking workers.