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.

The S&P 500 retreated 0.8% from its all-time high, and bond yields ticked higher. The Dow industrials fell 0.9%.