From this:

The San Francisco board of supervisors voted Tuesday to overturn a city policy that has been at the center of a national debate over offering illegal immigrants sanctuary.

The policy, ordered by Mayor Gavin Newsom last summer, requires the police to contact Immigration and Customs Enforcement whenever they arrest a juvenile on felony charges who they suspect is in the United States illegally. Since the policy took effect last summer, more than 100 undocumented minors have been turned over to federal immigration authorities.

Mr. Newsom has said the ordinance is necessary to prevent young criminals from using the city’s so-called sanctuary policy, which prevents the use of city money for immigration enforcement.

Newsom is running for governor, and I'll leave it to others to decide whether this will help him or hurt him. It might make him look tougher on enforcement since he intends to try to veto the resolution. However, it will also draw more attention to his very strong support for illegal immigration; he only pushed for the now-rescinded rule after a high-profile multiple murder and after arrested juveniles who'd been sent to care homes simply walked away.