RIO GRANDE CITY, TX – DECEMBER 07: A father holds his sleeping son, 3, after they and other undocumented immmigrants were detained by Border Patrol agents on December 7, 2015 near Rio Grande City, Texas. They had just illigally crossed the U.S.-Mexico border, and he said he was bringing his family from Guanajuato, Mexico to settle in San Antonio, Texas. The number of migrant families and unaccompanied minors crossing the border has again surged in recent months, even as the total number of illegal crossings nationwide has gone down from the previous year. (Photo by John Moore/Getty Images)