U.S. stock indices closed higher on Monday following a volatile opening session, as markets reacted to President Donald Trump's weekend announcement threatening to impose higher tariffs on additional countries.

Key Market Movements:

• Dow Jones Industrial Average gained 88.14 points (0.20%)

• S&P 500 rose 8.81 points (0.14%)

• Nasdaq Composite added 54.80 points (0.27%)

Market Context:
Investors continue monitoring tariff developments after Trump announced Saturday (via CNBC) that the U.S. would impose 30% tariffs on the European Union and Mexico effective August 1st.