Separate warnings by the chipmaking giant and the chairman of the Federal Reserve about the impact of White House policies contributed to another sell-off on Wall Street.

U.S. stocks fell Wednesday after Nvidia warned new restrictions on exports to China will chisel billions of dollars off its results, while companies around the world said President Donald Trump’s trade war is clouding forecasts for how they and the economy will do this year.

Nvidia is caught in the middle of an escalating trade war between the world’s two largest economies. Nvidia on Tuesday said it will take a $5.5 billion financial hit after Washington placed fresh restrictions on the export of its H20 artificial intelligence chips to China,