The U.S. Department of Justice has initiated a lawsuit against the City of Denver, challenging its longstanding ban on assault weapons, which was first enacted in 1989. The DOJ claims that the ban is unconstitutional and violates the Second Amendment. Denver officials, including the mayor, have responded defiantly, stating that they will not repeal the ordinance despite the federal demands and legal threats from the Trump administration. This legal battle is emblematic of the ongoing tensions between state and federal authorities over gun control measures.