The House of Representatives passed a resolution urging President Donald Trump to cease military action against Iran and withdraw U.S. forces involved in hostilities unless Congress explicitly authorizes war. The measure passed 220-204, with seven Republicans joining Democrats, including Reps. Zach Nunn and Mariannette Miller-Meeks of Iowa, who face competitive House races. Although nonbinding, the resolution strengthens congressional pressure over escalation and presidential war powers. Market pricing for a full Iranian airspace closure by December 31 has declined, while Senate action, statements from President Trump, Iranian responses and diplomatic efforts remain key developments for conflict-related prediction markets.