Stock market today: Dow, S&P 500, Nasdaq futures slump as US-China trade tensions rattle nerves

US stock futures turned lower on Tuesday after China retaliated to US shipping curbs, reviving trade-war fears for investors waiting for Wall Street's biggest banks to kick off earnings season. Dow Jones Industrial Average futures (YM=F) slid 0.4%, while those on the S&P 500 (ES=F) dropped 0.7%. Contracts on the tech-heavy Nasdaq 100 (NQ=F) sank 0.9% to lead the retreat. Stocks are reversing from Monday's strong rebound amid a fresh round of retaliation from Beijing to President Trump's tariff threats, ...