The Trump administration has dropped a legal gauntlet on Denver, ordering the city to scrap its long-standing assault-style weapons ban or get ready to fight it out in federal court.
On Monday, the U.S. Department of Justice told city leaders to repeal the ordinance that has been part of Denver law for more than three decades. Standing on the steps of the City and County Building with the police chief and local advocates at his side, Mayor Mike Johnston promised the city would defend the law, setting up a high-stakes clash between federal power and local gun rules.
According to Denverite, an April 28 DOJ letter ordered Denver to immediately stop enforcing its assault-weapons ordinance, formally concede that the measure is unconstitutional, and agree to a court-enforceable consent decree. The department warned it would sue the city and the Denver Police Department for an alleged Second Amendment violation if Denver refused. Attorney Harmeet Dhillon wrote that the law "bans an arm in common use for lawful purposes," language that mirrors DOJ's constitutional theory. Denverite also reported that this appears to be the first federal challenge to Denver's decades-old ban.
City officials wasted no time pushing back. Axios Denver reported that Mayor Johnston blasted the DOJ move as federal overreach and said, "Denver's law has stood for 37 years because it works, it saves lives, and it reflects the values of our community." The city's formal response, released by the mayor's office, called the DOJ demand baseless and argued that Denver has clear legal authority to regulate firearms within its borders. A letter from Denvergov lays out the city's detailed legal position.
Longstanding local law
Denver's assault-weapons ordinance dates back to 1989, when the city council adopted it after a recommendation from then Police Chief Ari Zavaras. The law bans the sale and possession of certain semiautomatic rifles and high-capacity magazines inside city limits. The Denver Post has chronicled how the measure has repeatedly survived legal challenges and become a touchstone of local gun policy. City leaders now point to that long record as a key reason they say they are prepared to fight any federal attempt to overturn it.
What DOJ is seeking and the possible path forward
As Denvergov and city officials describe it, the paths ahead range from a drawn-out court battle to some kind of negotiated settlement or consent decree. Any of those outcomes could reshape how local gun regulations are enforced. In its written response, Denvergov argues that the ordinance is consistent with both state law and the U.S. Constitution, and notes that Denver recorded a historic drop in homicides last year as part of its defense. Any federal lawsuit would test the post-Bruen Second Amendment doctrine and could influence how other cities approach similar bans.
Local advocates and city councilmembers joined Johnston at Monday's news conference, signaling that City Hall is lining up behind the ordinance. Denver Police Chief Ron Thomas also voiced support for defending the law, underscoring broad municipal resistance to the DOJ's pressure. The Denver Post has tracked reactions from Colorado lawmakers and national advocacy groups that are watching closely to see whether this federal move sparks similar challenges elsewhere. If the case lands in federal court, it could become a flashpoint in the national fight over local control and gun regulation.
For now, there is more legal saber-rattling than actual courtroom action. No federal lawsuit has been filed yet, and the DOJ has not publicly commented beyond its letter, leaving the timing of any case up in the air. If the department follows through and sues, expect weeks of filings and legal briefs. Denver officials say they are prepared to make their case in court.
