It's all grandstanding. Just let another major hurricane rip the roofs from a few thousand homes and any Mexican laborer with a hammer will be allowed into the US. The majority of roof repairs done after the last two hurricane seasons have been done by Mexican workers. If it weren't for them, thousands of people in the south would still be waiting for repairs.

The reality is that many Americans welcome the help of non-Americans in time of need, but when that need is satisfied good old American arrogance assumes its usual position in the forefront of the communal American personality. "Here's your money. Gracias for your help. Now get on home and don't let the gate at the border hit you in the ass."