Federal Government Challenges Denver’s Authority to Regulate ICE Officers

October 9, 2026

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By Alayna Alvarez | Axios Denver

The Trump administration sued Denver on Thursday over its ban on federal law enforcement officers wearing face masks.

Why it matters: The lawsuit challenges one of Denver’s most direct attempts to rein in ICE agents amid an escalating legal fight over immigration enforcement.

Driving the news: The U.S. Department of Justice filed the lawsuit against Denver, Mayor Mike Johnston, City Attorney Miko Brown and police chief Ron Thomas.

  • The DOJ argues the city ordinance violates the Constitution’s Supremacy Clause, which limits local authority over federal operations.

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