"Escalating a threat to withhold grants from state and local governments that block the police from telling federal authorities about undocumented immigrants in custody, the Trump administration sent letters Friday to nine jurisdictions telling them they were obligated to prove compliance.
Recipients of the letters were warned that to receive certain fiscal year 2016 grants, they must certify by June 30 that they have complied with a 1996 federal law that bars local authorities from forcing officials to withhold information from federal immigration authorities about people’s immigration status."
https://www.nytimes.com/2017/04/21/us/politics/sanctuary-city-justice-department.html?_r=0
Recipients of the letters were warned that to receive certain fiscal year 2016 grants, they must certify by June 30 that they have complied with a 1996 federal law that bars local authorities from forcing officials to withhold information from federal immigration authorities about people’s immigration status."
https://www.nytimes.com/2017/04/21/us/politics/sanctuary-city-justice-department.html?_r=0