What Is a Sanctuary City? Definition, Laws, and the 2026 Fight
A sanctuary city is a city, county, or state that limits how much local government agencies cooperate with federal immigration enforcement. While there is no single legal definition of a sanctuary jurisdiction, these policies typically involve restrictions on how local police, sheriffs, and jails assist U.S. Immigration and Customs Enforcement (ICE).
The topic has become one of the most debated immigration issues in America as the federal government increases pressure on sanctuary jurisdictions through lawsuits, funding threats, and proposed legislation.
Table of Contents
- What Is a Sanctuary City?
- How Sanctuary Policies Work
- What Is an ICE Detainer?
- What Sanctuary Cities Do Not Do
- History of Sanctuary Cities
- Why Sanctuary Cities Are Controversial
- Why the Debate Has Intensified in 2026
- Proposed Federal Legislation
- Arguments From Supporters and Critics
- Frequently Asked Questions
- The Bottom Line
What Is a Sanctuary City?
A sanctuary city is a local government that limits cooperation with federal immigration authorities.
The term can apply to:
- Cities
- Counties
- States
- Municipal governments
There is no official federal legal definition of a sanctuary city.
Instead, the label generally refers to jurisdictions that have adopted policies reducing local participation in immigration enforcement activities.
Some jurisdictions embrace the label publicly, while others reject the term even though they maintain policies that critics classify as sanctuary measures.
Because policies vary widely, two sanctuary jurisdictions may operate very differently from one another.
How Sanctuary Policies Work
Sanctuary policies usually focus on the relationship between local law enforcement agencies and federal immigration authorities.
Common policies include:
Limiting ICE Detainer Compliance
Local jails may decline requests from ICE to continue holding an individual after their scheduled release date.
Restricting Information Sharing
Some jurisdictions limit what information local agencies can voluntarily share with federal immigration authorities.
Limiting Jail Access
Certain policies restrict ICE access to interview detainees inside local correctional facilities.
Preventing Local Resources From Being Used for Federal Enforcement
Some local governments prohibit city employees from participating in immigration enforcement activities unless required by law.
The scope of these policies varies significantly across the country.
What Is an ICE Detainer?
One of the most important concepts in the sanctuary-city debate is the ICE detainer.
An ICE detainer is a request from federal immigration authorities asking a local jail to hold an individual for up to 48 hours beyond their scheduled release date.
The purpose is to allow ICE officers time to assume custody.
Supporters of sanctuary policies often argue that honoring detainers without judicial warrants can create legal and constitutional concerns.
Critics argue that refusing detainers allows individuals targeted by federal immigration authorities to return to communities before ICE can take custody.
This disagreement lies at the center of many sanctuary-city disputes.
What Sanctuary Cities Do Not Do
One of the biggest misconceptions is that sanctuary cities prevent federal immigration enforcement.
They do not.
Federal immigration authorities retain full authority to operate within sanctuary jurisdictions.
ICE can still:
- Conduct investigations
- Make arrests
- Execute warrants
- Pursue immigration enforcement operations
Sanctuary policies generally govern what local officials will do—not what federal officials can do.
This distinction is often overlooked in public debate.
The History of Sanctuary Cities
The origins of the sanctuary movement date back decades.
The 1980s Sanctuary Movement
Religious organizations across the United States began offering support and shelter to migrants fleeing violence in Central America.
Many churches viewed this work as a humanitarian mission.
The movement became known as the Sanctuary Movement.
Expansion Into Local Government Policy
During the 1990s and 2000s, cities began adopting formal policies limiting cooperation with federal immigration enforcement.
Over time, the concept evolved into modern sanctuary-city policies.
Today, dozens of cities, counties, and states maintain some form of limited-cooperation policy.
Why Sanctuary Cities Are Controversial
Immigration remains one of the most politically divisive issues in the United States.
Sanctuary policies sit directly at the center of that debate.
Critics Argue
Opponents contend that sanctuary policies:
- Undermine federal immigration law
- Interfere with lawful enforcement efforts
- Create public safety concerns
- Allow some individuals sought by ICE to avoid detention
Supporters of stricter enforcement argue that immigration enforcement should be applied consistently nationwide.
Supporters Argue
Defenders of sanctuary policies maintain that:
- Local police need trust from immigrant communities
- Fear of deportation can discourage crime reporting
- Witnesses may refuse to cooperate with investigations
- Local governments should determine how resources are allocated
Many supporters also frame the issue as one involving federalism and local autonomy.
Why the Debate Has Intensified in 2026
Sanctuary jurisdictions have become a major target of federal immigration policy in 2026.
Several actions have brought renewed attention to the issue.
Federal Lawsuits
The Department of Justice has pursued legal challenges against jurisdictions accused of impeding immigration enforcement.
These lawsuits seek greater cooperation with federal authorities.
Funding Disputes
Federal officials have repeatedly raised the possibility of limiting federal funding to sanctuary jurisdictions.
These proposals remain subject to ongoing legal and political challenges.
Public Lists of Jurisdictions
Federal agencies have published lists identifying jurisdictions they believe limit immigration enforcement cooperation.
The publication of these lists has increased scrutiny of local policies nationwide.
As a result, sanctuary-city policies have become a major issue in local elections, state legislatures, and federal policy debates.
Proposed Federal Legislation
Several congressional proposals introduced in 2026 seek to address sanctuary jurisdictions.
End Sanctuary Cities Act
Supporters say the bill would strengthen immigration enforcement and reduce sanctuary policies nationwide.
Sanctuary City Elimination Act
Another proposal would create new penalties and restrictions for jurisdictions that limit cooperation with federal immigration authorities.
Criminal Penalties Proposals
Some lawmakers have proposed measures that could impose penalties on officials who intentionally obstruct federal immigration enforcement.
Supporters argue these measures would strengthen compliance.
Critics argue they could undermine local self-government and create constitutional challenges.
As of June 2026, these proposals remain legislative proposals rather than enacted federal law.
Legal Questions Surrounding Sanctuary Policies
Several constitutional issues continue to shape the debate.
Federal Authority
The federal government possesses primary authority over immigration enforcement.
State and Local Authority
States and local governments generally control their own law-enforcement resources.
Anti-Commandeering Doctrine
Federal courts have repeatedly recognized that the federal government cannot simply require state and local governments to carry out federal programs.
This principle plays a significant role in ongoing sanctuary-city litigation.
Future court decisions could significantly influence how sanctuary policies evolve.
What This Means for Residents
If you live in a sanctuary jurisdiction, these debates could affect:
- Local policing policies
- Municipal budgets
- Federal funding disputes
- Immigration enforcement practices
- Future local legislation
Some jurisdictions continue expanding sanctuary policies, while others have modified or rescinded them under legal or political pressure.
The landscape remains highly dynamic.
Frequently Asked Questions
What makes a city a "sanctuary city"?
There is no official definition, but the label generally applies to jurisdictions that limit local cooperation with federal immigration enforcement, per [Wikipedia](https://en.wikipedia.org/wiki/Sanctuary_city). Typical policies include declining ICE detainer requests, limiting ICE access to local jails, and restricting information sharing, per [CIS](https://cis.org/Map-Sanctuary-Cities-Counties-and-States).
Are sanctuary cities illegal?
Sanctuary policies themselves are generally local laws passed through normal processes, and courts have repeatedly weighed disputes about them. The Justice Department argues some policies unlawfully impede federal enforcement and has sued several jurisdictions, per [DOJ](https://www.justice.gov/opa/pr/justice-department-publishes-list-sanctuary-jurisdictions). Bills in Congress would change the legal landscape, but they had not become law as of June 10, 2026.
Can ICE still arrest people in sanctuary cities?
Yes. Sanctuary policies limit what local officials will assist with — they do not prevent federal agents from operating or making arrests. The policies most often affect jail handoffs, detainer requests, and information sharing between local agencies and ICE, per [CIS](https://cis.org/Map-Sanctuary-Cities-Counties-and-States).
Which places count as sanctuary jurisdictions?
It depends on who is counting, because definitions vary. The Justice Department has published its own list of jurisdictions it says impede immigration enforcement, per [DOJ](https://www.justice.gov/opa/pr/justice-department-publishes-list-sanctuary-jurisdictions), and the Center for Immigration Studies maintains a [map of sanctuary cities, counties, and states](https://cis.org/Map-Sanctuary-Cities-Counties-and-States).
Why do cities adopt sanctuary policies?
Common reasons cited by supporters: building immigrant communities' trust in local police so crimes get reported, focusing local resources on local priorities, and constitutional limits on federal commandeering of local officials, per arguments summarized in [The Hill](https://thehill.com/opinion/immigration/5786501-sanctuary-cities-act-congress/). Opponents counter that the policies shield people from lawful federal enforcement.
Michael Carter
Michael Carter is a U.S.-based researcher and content editor who specializes in public safety alerts, government updates, consumer information, and technology trends. He focuses on breaking down complex topics into clear, easy-to-understand guides that help readers stay informed and make better decisions.