San Francisco Mayor Gavin Newsom has said several times that he and other San Francisco officials remain committed to offering illegal immigrants refuge in the city.
San Francisco has been a sanctuary city since 1989. The designation, adopted by cities across the country in the late 1980s and early 1990s has no legal meaning.[SAN FRANCISCO / City is sued for failing to report noncitizens arrested for drugs / Activist contends police are breaking California law, by Leslie Fulbright, San Francisco Chronicle, May 11, 2007]
Of course, to the extent that "sanctuary" has a legal meaning, the meaning is something like "harboring," "aiding and abetting" or "corruption."