S tocks closed down significantly on Monday after President Donald Trump announced steep tariffs on seven countries and threatened to impose new levies on others. The Dow Jones Industrial Average closed down 422 points, or 0.9%, while the S&P 500 dropped 0.7%. The tech-heavy Nasdaq declined 0.9%.

The Dow Jones closed down over 400 points on Monday as President Trump sent letters to foreign countries warning of tariff increases that would go into effect August 1. CBS News MoneyWatch correspondent Kelly O'Grady has the details.

Stocks on Wall Street fell sharply on Monday, led by losses across major indices, including the Dow Jones Industrial Average, S&P 500, and Nasdaq. The S&P 500 shed 0.8%, its worst single-day drop since mid-June, while the Dow and Nasdaq both declined 0.9%. Despite the setback, all three indices remained close to their recent record highs.