Sanctuary City Leaders Undermine Constitutional Federal Law and ICE Authority

Sanctuary policies involve city leaders such as New York City Mayor Zohran Mamdani, Chicago Mayor Brandon Johnson, Boston Mayor Michelle Wu, and Minneapolis Mayor Jacob Frey limiting cooperation with federal immigration enforcement. This can include restricting information sharing with federal agencies or refusing to honor immigration detainer requests that ask local jails to hold individuals for ICE. These policies directly affect how federal immigration law is carried out on the ground and are often defended as local control or community safety measures.

“The Congress shall have Powr... To establish an uniform Rule of Naturalization.” Article I, Section 8, Clause 4 of the U.S. Constitution gives immigration and citizenship authority to the federal government. Article VI adds that federal law is the “supreme Law of the Land,” meaning it overrides conflicting state or city rules. Immigration law and enforcement are set at the national level, not changed city by city or through local policy.

The Supreme Court has confirmed immigration is primarily a federal responsibility. In Arizona v. United States, the Court ruled that immigration enforcement must be uniform across the country. Courts also recognize the anti-commandeering rule, meaning the federal government cannot force states or cities to carry out federal law. However, that rule does not allow local governments to block, restrict, or interfere with federal enforcement operations.

Federal immigration agents operate under the Immigration and Nationality Act, giving them authority to enforce federal law nationwide, including serving warrants, making arrests, and carrying out administrative immigration actions. That authority does not stop at city or state borders. While cities are not required to enforce federal law, they also cannot take actions that actively obstruct or reduce the effectiveness of lawful federal enforcement.

When cities limit cooperation with federal immigration authorities, it can create uneven enforcement of federal law from place to place. The Constitution was designed to prevent this kind of patchwork system. It places immigration authority at the federal level so the same rules apply nationwide, in line with the Constitution.