Stocks fall sharply Monday, extending declines in late afternoon trade as President Donald Trump affirmed 25% tariffs on imports from Canada and Mexico will take effect. Earlier, stocks felt pressure after a weaker-than-expected February reading for a key manufacturing index.

Stocks fell on Wall Street Monday, ahead of President Donald Trump’s latest deadline on tariffs. The S&P 500 was 1% lower in afternoon trading. The Dow Jones Industrial Average was down 402 points, or 0.

Since his inauguration last month, President Trump has been relatively muted about the stock market. Investors are getting worried about an impending sell-off.

Key Takeaways Shares of Nvidia were down 10% Monday afternoon, falling into bear market territory. The company's latest quarterly financial results raised questions about what was next for the stock—and the AI trade—and uncertainty driven by US trade policy has further concerned investors.

Investors wary of President Trump's plan to add tariffs of 25% on imports from Mexico and Canada, as well as a negative GDP forecast.

US stocks open slightly up but quickly dip. Markets wait to see if Canada, Mexico and China tariffs go as planned on Tues. Trump gives crypto breath.