Sanctuary jurisdictions are state and local governments which have decided to limit the ability of their law enforcement agencies to detect and apprehend illegal aliens.
Airports in Washington State, most prominently including King County International Airport near Seattle, are refusing to service ICE Air flights. For the time being, ICE is using McAllister Field in Yakima to transport detained aliens to and from its detention center near Tacoma.
Bristol County Sheriff Thomas Hodgson, an ally of President Donald Trump, supports an initiative to prevent Massachusetts from becoming a sanctuary state. This proposed legislation would permit local authorities to cooperate with ICE in detaining illegal aliens.
King County, WA, severs its connection with LInX, an important law enforcement information sharing system that enables investigators to search for data across jurisdictional boundaries. This federal system helps them to prevent, stop and solve crimes.
The New Jersey State government is demanding that sheriffs in Monmouth County and Cape May County discontinue cooperation with ICE, wherein information on criminals who are in the country illegally is turned over to federal immigration authorities.
Oregon, the first sanctuary state, will receive federal criminal justice funding which the Trump administration tried to block, in an attempt to compel sanctuary jurisdictions to cooperate with federal immigration law enforcement agencies.
The IDNYC card is New York City's way of granting a form of legal identification to aliens who are in the U.S. illegally. This might be considered "harboring" under 8 U.S. Code § 1324, which is a very serious offense.