Start enforcing federal law on cities and employers supporting them and they will leave on their own.
Let’s freeze “all” immigration, legal as well , until the courts figure out how we can deport criminal aliens. No deportation, no immigration. And, actually defend border to prevent new illegal crossings. Use military if necessary. And , provide crippling fines and jail time to any company with illegal alien workers. And deny any taxpayer funded benefits to anyone here illegally. A lot would self deport.
Trump will find anything he does rough sledding because the state and federal bureaucracies are going to flat out mutiny.
THOSE LAWS have been on the books for YEARS.
FINE==$5,000 per day per employee.