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HOLTVILLE, CA - SEPTEMBER 27: Mexican farm workers hoe a cabbage field on September 27, 2016 Holtville, California. Thousands of Mexican seasonal workers legally cross the border daily from Mexicali, Mexico to work the fields of Imperial Valley, California, some of the most productive farmland in the United States. (Photo by John Moore/Getty Images)

HOLTVILLE, CA - SEPTEMBER 27:  Mexican farm workers hoe a cabbage field on September 27, 2016 Holtville, California. Thousands of Mexican seasonal workers legally cross the border daily from Mexicali, Mexico to work the fields of Imperial Valley, California, some of the most productive farmland in the United States.  (Photo by John Moore/Getty Images)