This failure due to political cowardice and calculation, greed and sheer stupidity can one day pose a military threat via "fourth generation warfare" to this nation. The Mexican government through its meddling in our internal affairs is promoting a nonmilitary invasion with the people they wish to dump. The "Reconquest" types are over here in the form of MEChA and the brown supremacists of "La Raza". I have seen the third world- over there and increasingly over here. This is not Brazil. Deport them all, secure the border with the U.S. Armed Forces and try all employers who willfully hire these criminals under the R.I.C.O. Act.
That will not work. The U.S. military falls up under the President. When he/she/it is a Democrat, the military is moved off the border.
Just that simple.
Technology and a vast beefing up of the BP is what is needed for border enforcement. What you said about going after businesses who hire illegals is spot on, however.