XenaLee wonders:
"Is another war with Mexico on the horizon?"
I think there is more than a chance of just that.
Mexico is going to have to take back at least some of the illegals here.
At the very least, those convicted of criminal behavior and deported.
There are two choices:
1. They will accept them peacefully.
2. They'll accept them under threat of force, or after the use of force.
I have no problems with using the appropriate military force against Mexico to achieve choice #2 above.
Indeed, I think such force would be a far more appropriate use of the military to "defend the United States" than the [essentially] useless expeditions we are pursuing in the Middle East right now (particularly in Afghanistan).