re: Border control
Yes, there's quite a bit of overlap in concern between border security and immigration... but the two issues are not one and the same. At least they don't seem to be, in either public or legislative opinion. If they were, as much attention would be paid to the US/Canadian border in the immigration discussion ... but everyone seems to be talking only about Mexico.
Of the "Cherry Hill 6", at least three were illegal - but I believe that was due to expired visas, legitimately issued and originally legal. I don't know where they first entered the US, but I suspect it was through an airport on the East Coast.
How will closing the southern borders of California, Arizona, New Mexico and Texas solve that problem?