ICE immigration detainers request state and local law enforcement agencies to notify ICE when they are about to release from custody a person who was arrested on a criminal violation, because they are believed to be in the country illegally.
The ACLU intervened massively in the race for sheriff in Mecklenburg County, NC, in support of the candidate calling for an end to Mecklenburg's participation in the ICE 287(g) program, which enables the deportation of illegal aliens about to be released from prison.
At a September 26, 2019 press briefing, Acting ICE Director Matthew Albence debunked common myths perpetuated by opponents of ICE 287(g) programs, by which local law enforcement agencies detain alien criminals on behalf of ICE.
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.
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.