Investors are watching closely to see how President Trump's tariffs could influence the Fed’s stance on interest rates and the broader economic outlook. The countdown is on for the Fed's rate decision on Wednesday as policymakers begin their two-day meeting.

Stock futures are lower Tuesday as investors react to a steady stream of earnings reports while awaiting news on tariffs and the results of the two-day Federal Reserve meeting that is set to start today.

U.S. stock index futures were lower on Tuesday after President Donald Trump's comments on potential pharma tariffs renewed worries of the impact of a trade war, while some downbeat corporate results also weighed on investor sentiment.