The Dow Jones Industrial Average tumbled more than 370 points, Treasuries rallied the most since July and volatility spiked higher as the turmoil surrounding the Trump administration roiled financial markets around the globe.
Major U.S. stock indexes had the worst session in eight months, while the CBOE Volatility Index jumped the most since the U.K. voted to leave the European Union last June, shattering the calm that gripped markets in the past month as the crisis threatened to derail the policy agenda that helped push equities to records as recently as Monday.
