Take 90% of the Border Patrol and audit businesses for their I-9 forms and photo copy of employees photo ID and SS card.
If they can’t provide them fine them the maximum and jail time for a second offense.
Include homeowers that pick them up on a street corner..
A few dozen doing jail time and the illegals will self deport.
Durring Eisenhowers time the L.A. area there were Border Patrol agents raiding businesses 5 days a week and illegals didn’t last more than 2 weeks.
I suggest reading the Fourth Amendment for what it says. Such "audits" are wildly unconstitutional.