The Trump administration is making moves to withhold U.S. Department of Justice funds from cities and states with "sanctuary" laws the administration claims thwart federal efforts to enforce immigration laws.

The threats of defunding are especially alarming for cities like San Francisco, where services such as Bay Area Rapid Transit are starting at a fiscal cliff. San Francisco and Santa Clara could potentially lose billions of dollars in funding for necessary services, said Chiu and Tony LoPresti, who represents Santa Clara County.