This will last until the block grants and matching funds stop - at which point Jerry Brown will be rounding them up himself.
Remember when the Feds forced the 55 mph speed limit on all of the states? Either the states followed the law or they received no federal highway funds. Same thing could be done with illegal immigration.
The Emergency Highway Energy Conservation Act was a bill in the U.S. Congress that enacted the National Maximum Speed Law. States had to agree to the limit if they desired to receive federal funding for highway repair. The uniform speed limit was signed into law by President Nixon on January 2, 1974, and became effective 60 days later, by requiring the limit as a condition of each state receiving highway funds, a use of the Commerce Clause of the United States Constitution.
The legislation required 55 mph (90 km/h) speed limits on all four-lane divided highways unless the road had a lower limit before November 1, 1973