# US Supreme Court firearm regulation litigation > Live situation record from CLSTR: https://clstr.news/situations/us-supreme-court-firearm-regulation-litigation > Updated: 2026-09-06T22:37:26.000Z. Sources: 5. Developments: 2. The US Supreme Court has agreed to hear Viramontes v. Cook County, a legal challenge against a ban on modern semi-automatic firearms, with oral arguments scheduled for December 2, 2026. This case is part of an increasing number of Second Amendment challenges, including petitions regarding magazine capacity limits in California and mandatory waiting periods in Maine. Following this development, the US Department of Justice filed an amicus curiae brief urging the Supreme Court to strike down state and local bans on AR-15 rifles. Solicitor General D. John Sauer argued that such restrictions violate the Second Amendment, asserting that the amendment protects firearms commonly possessed by law-abiding Americans for lawful purposes. The Justice Department’s position was presented in relation to the Viramontes v. Cook County case and Grant v. Higgins, specifically addressing laws in Illinois and Connecticut that prohibit firearms classified as ‘assault weapons.’ ## Timeline ### 2026-09-06: U.S. Justice Department urges Supreme Court to strike down AR-15 bans The U.S. Justice Department is urging the Supreme Court to overturn AR-15 bans in Connecticut and Cook County, arguing they violate Second Amendment rights. 3 sources. https://clstr.news/cluster/us-justice-department-urges-supreme-court-to-strike-down-ar-15-bans ### 2026-09-04: US Supreme Court to hear case on semi-automatic firearm bans The US Supreme Court will hear Viramontes v. Cook County regarding semi-automatic firearm bans, alongside several other high-profile Second Amendment challenges across various states. 3 sources. https://clstr.news/cluster/us-supreme-court-to-hear-case-on-semi-automatic-firearm-bans --- Cite as: US Supreme Court firearm regulation litigation. CLSTR, https://clstr.news/situations/us-supreme-court-firearm-regulation-litigation