Why It Matters
The Trump administration’s aggressive legal campaign against sanctuary jurisdictions represents one of the most significant federal-local immigration enforcement showdowns in recent years. The outcome will determine whether cities and states can enforce policies that restrict cooperation with federal immigration authorities—a question that touches on constitutional limits of local power, immigration enforcement strategy, and the balance between federal and local law enforcement.
What Happened
Since returning to office in January 2025, the Trump administration has filed 27 lawsuits targeting more than 20 cities, counties, and states with sanctuary policies. Within the past three months alone, federal attorneys have sued at least six jurisdictions: Connecticut, Maryland, New Jersey, New York, a Michigan county, and Philadelphia.
Sanctuary policies typically restrict immigration enforcement in public spaces, limit local law enforcement cooperation with Immigration and Customs Enforcement (ICE), and prohibit certain tactics—such as agents concealing their identity while on duty. Some cities have maintained these policies since the 1980s.
The Justice Department sued four New Jersey cities—Hoboken, Jersey City, Newark, and Paterson—in May 2025 over their sanctuary ordinances. A federal district judge appointed by the previous administration dismissed that suit. However, the administration subsequently sued New Jersey itself in late April over a state law enacted in March that prohibits immigration agents from shielding their identity during enforcement operations.
Philadelphia faces separate legal pressure. The Justice Department sued the city last month over an ordinance barring immigration agents from wearing masks, concealing badges, or using unmarked vehicles. A federal district judge appointed by President Trump issued a preliminary injunction blocking implementation of that policy. Philadelphia’s City Council had approved seven ICE-related bills in April; six have taken effect.
Maryland presents another flashpoint. A state law that took effect May 31 prohibits state and local officers from inquiring about immigration status or detaining individuals based on immigration violations. The Justice Department sued Maryland last week. Separately, sheriffs from 17 Maryland counties filed their own lawsuit in May to block the state law.
By the Numbers
27 — lawsuits filed by the Trump administration against sanctuary jurisdictions since January 2025
20+ — cities, counties, and states targeted
6 — Philadelphia ICE-related bills currently in effect out of seven approved by City Council
17 — Maryland counties whose sheriffs sued the state to overturn the new immigration law
1980s — when some cities first adopted sanctuary policies
Zoom Out
Sanctuary policies have existed for decades, emerging in the 1980s as some cities sought to limit local involvement in federal immigration enforcement. The practice has grown, particularly in Democratic-led jurisdictions on the coasts and in major metropolitan areas.
The Trump administration’s legal strategy reflects a broader shift in immigration enforcement posture. The lawsuits challenge the constitutional authority of local governments to obstruct federal immigration operations—a principle that separates enforcement powers between levels of government. Federal courts have issued mixed rulings so far, with some judges dismissing administration claims and others granting injunctions to block local sanctuary measures.
The disputes also reflect diverging views among law enforcement. While some sheriffs and local police chiefs have backed sanctuary policies, citing community trust and safety benefits, others—particularly county sheriffs in states like Maryland—have opposed them as impediments to lawful detention and information-sharing with federal authorities.
What’s Next
Federal courts will continue deciding whether sanctuary ordinances and state laws can survive legal challenge. The administration’s litigation strategy suggests sustained pressure on sanctuary jurisdictions throughout 2025 and beyond. State legislatures may face pressure to clarify the authority of local officers to cooperate with ICE, while cities and states defending sanctuary policies will likely argue that local control over police resources and community relations justifies limits on federal immigration operations conducted through municipal channels.