Make it a Felony for a business or individule to employ anybody that is in the Country illegally.
If Immigration Officials visit a job site and find illegals, leave them be. Go to the headquarters of the business and haul the BOD out in handcuffs. Throw them in County Lockup.
Ignorance is no defence. It is up to a employer to insure the employees are in this Country legally.
If you stop feeding a stray cat, it will leave.