US inflation hits 3-year high at 4.2% as Iran war drives energy costs

The US Bureau of Labour Statistics reported on June 10, 2026, that the Consumer Price Index (CPI) rose 4.2% year-on-year in May, the highest reading since April 2023. The increase from April's 3.8% figure was in line with analyst expectations but marks a persistent upward trend since the US-Israel war against Iran began in late February 2026. The conflict has severely impacted global energy markets as Iran retaliated by virtually closing the Strait of Hormuz, a critical chokepoint for roughly 20% of the world's oil and natural gas shipments. This supply disruption has sent energy prices soaring, directly fueling the inflation spike.

President Donald Trump has publicly downplayed the price shock, calling it temporary and promising a peace deal soon. However, the prolonged conflict and continued energy price increases are becoming a major political liability for his administration. With midterm elections approaching in November 2026, the Republican Party seeks to maintain control of both houses of Congress. High inflation is already battering American households, raising the prospect of voter backlash and making the economic fallout from the Iran war a central campaign issue. The data underscores how geopolitical instability can quickly translate into domestic economic pain, with energy costs acting as the primary transmission mechanism.