Trump DOJ Challenges Colorado’s Large-Capacity Magazine Ban in Second Amendment Lawsuit

The Trump administration has filed a lawsuit against Colorado over its long-standing ban on large-capacity firearm magazines, escalating the national debate over gun rights and gun control laws in the United States. The Department of Justice argues that Colorado’s restriction on ammunition magazines holding more than 15 rounds violates the Second Amendment rights of lawful gun owners.

Colorado enacted the law in 2013 following the deadly Aurora movie theater shooting that killed 12 people and injured dozens more. The state’s law prohibits magazines capable of firing more than 15 rounds without reloading. According to the DOJ complaint, such magazines are commonly used with popular firearms, including AR-15-style rifles and semi-automatic pistols owned by millions of Americans.

The lawsuit cites the landmark 2008 Supreme Court ruling in District of Columbia v. Heller, which recognized an individual’s constitutional right to possess firearms for lawful purposes such as self-defense. Federal attorneys claim the Colorado law unlawfully restricts firearms and accessories considered “in common use” across the country.

Colorado Attorney General Phil Weiser strongly defended the state’s gun safety measures, arguing that large-capacity magazine restrictions help reduce casualties during mass shootings. Gun control advocates point to studies showing attacks involving high-capacity magazines often result in significantly higher death tolls because shooters can fire continuously without stopping to reload.

The legal battle follows another DOJ lawsuit challenging Denver’s assault weapons ban, signaling a broader push by the Trump administration against state and local firearm restrictions. Currently, 14 states and Washington, D.C. enforce limits on large-capacity magazines, though restrictions vary by state.

The outcome of the Colorado case could have major implications for future Second Amendment cases and gun control laws nationwide as courts continue to weigh public safety concerns against constitutional gun rights.