US stock futures fell after Nvidia revealed costly new curbs on chip exports to China, and investors grappled with uncertainty over President Trump's trade policy.

Nvidia stock falls after new China export curbs. Follow along for live updates on the Dow, S&P 500 and Nasdaq.

Asia-Pacific markets fell this morning after the U.S. barred Nvidia from shipping its H20 AI chip to China, intensifying the trade war between Washington and Beijing. Semiconductor companies declined more broadly on Trump's tightened export controls on Nvidia.

One large investment firm tracked the behavior of individual investors during the stock-market turbulence of early April. Here's what they found.

Federal Reserve chairman Jerome Powell warned that Pres. Trump's sweeping tariff policy threatens to reignite inflation across America, sparking stock markets losses.

The Fed chief warns higher inflation is likely, although officials routinely say their outlook depends on how Trump’s policies — on trade, immigration and more — shake out.