US stocks fell, with the S&P 500 having its worst day since October, after Trump threatened tariffs on countries that oppose his plans for Greenland.

Auto makers slide, while defense and mining stocks rally as investors fret about President Donald Trump’s push to acquire Greenland.

Follow along for live updates on the Dow, S&P 500, Nasdaq and other markets.

Small caps gained momentum Wednesday afternoon. A robotics name fell on preliminary results.

The stock market opened with losses Monday in the wake of the Trump administration opening a criminal probe into Federal Reserve Chair Jerome Powell. The Dow Jones Industrial Average was down roughly 300 points shortly after trading began for the first time since news broke of the investigation.

Wall Street retreated Wednesday as weakness in technology and financial stocks dragged major indexes lower, with investors remaining cautious ahead of a closely watched Supreme Court ruling on the legality of President Donald Trump's tariffs.

Investing.com -- JetBlue Airways (NASDAQ:JBLU) and Frontier Group (NASDAQ:ULCC) stocks fell 2% Thursday following reports that bankrupt carrier Spirit Airlines is in discussions with investment firm Castlelake about a potential takeover.

Follow along for live updates on the Dow, S&P 500, Nasdaq and other markets.

The Nasdaq Composite Index COMP peaked on March 10, 2000, and over the following two weeks this benchmark dropped more than 10% on an intraday basis — enough to satisfy the semiofficial criterion for a stock-market correction.