Securing the borders, besides being the right move for the cnation, could also be politically fruitful if framed the right way. Look at it this way:
1.) Reducing illegal immigration would halt the depression of wages in many blue collar jobs, boosting the middle class.
2.) Illegal immigrants generally take jobs that lower income people would take, which disproportionately affects African Americans, Legal hispanics, and tenagers.
3.) This is also an environmental issue. If environmental groups are truly sincere in their goals, then a population explosion is the last thing they should want.
The Dems can try woeing them, and they will lose most of their American voters. I think the US is saying "adios" to the illegal immigrants.