If we don't control our borders, how do we keep terrorists out?
Do we want someone bringing a suitcase nuke into the USA?
I don't think so.
This goes way beyond people looking for jobs picking grapes and hanging drywall, there are important national security issues involved in this.
I am not opposed to immigration, I'm married to an immigrant who is now a U.S. citizen.
But my wife entered the USA legally and that's the only way that anyone should enter the USA.
For me this not a negotiable issue.
"If you don't know where you are going, any road will get you there." ~ Lewis Carroll