The countdown is on to the Fed's rate decision on Wednesday as policymakers begin their two-day meeting. Although the central bank is expected to keep rates unchanged, Wall Street

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 fell on Monday after President Donald Trump reignited concerns about the effects of a global trade war by introducing new tariffs, while markets awaited the Federal Reserve's monetary policy decision this week.