US stocks declined as President Trump announced plans to impose a new 15% global tariff, sparking market uncertainty. Gold and WTI crude oil emerged as top performers amid fears of economic disruption and geopolitical tensions. Trump denied recent leaks about potential US military action against Iran, though Polymarket forecasts suggest a 60% chance of an attack within 19 days. The tariff news weighed heavily on equities, while safe-haven assets gained traction.