We’re screwed, and we should admit it and just learn Spanish.
1) If illegals fight officers of the law, or use any weapon, allow the officers to respond with lethal force. As of now, they are required to act like pansies when illegals fire weapons across the border.
2) Allow illegals to sue employers who pay them less than minimum wage. [This is Ann Coulter's idea.] The lawsuits alone would bankrupt the employers who exploit them. Add this on to employer penalties for hiring illegals. There would be zero advantage to hiring illegals, and employers would hire ordinary Americans.
3) A tamper-proof national identity card with biometrics. Sorry, ACLU, but this is your fault for defending the "rights" of illegals for 40 years.
Of course, do away with all the other bullsh-t things like citizenship to illegal babies, free education and medical, etc. But if 1) and 2) were implemented you would see millions of illegals high-tailing it home.
I'd even donate money for the bus that drives them to the border.