U.S. stock investors are worried about the independence of the Federal Reserve, with the Dow Jones dropping 400 points in early trading and bank stocks plummeting, Citigroup down 4%

U.S. stocks fell as Federal Reserve Chairman Jerome Powell faced a criminal investigation by the Trump administration, with the Dow dropping over 400 points after the market opened, and bank stocks plummeting, with Citigroup's share price falling by 4%. The U.S. dollar index sharply declined, and the yield on 10-year bonds rose. The market expressed concerns about the independence of the Federal Reserve, with experts pointing out that the market reaction was a sell-off. Goldman Sachs believes that Powell will continue to make decisions based on economic data