STOCKSHOTS:McAllen, Texas, center of immigration policy debate The immigration debate in the US is currently centering around the Texas border city of McAllen, which has the country's largest immigration processing center. The Trump administration has recently come under fire for its "zero tolerance" policy leading to thousands of migrant families being split up, many of which are taken to the center in McAllen before being sent to separate facilities. STOCKSHOTS of border and humanitarian respite center in McAllen, Texas