AdvertisementAs Trump Visits Calexico, Calif., Residents Worry About Rising Border Wall TensionApril 04, 2019Max Rivlin-NadlerfacebookEmailMexican agricultural workers wait at a Calexico doughnut shop before dawn to be driven to farms in the Imperial Valley after crossing the border. President Trump is scheduled to visit Calexico, Calif., on Friday. (Max Rivlin-Nadler for NPR)