US stock futures fell on Tuesday in the wait for the Federal Reserve meeting to start, as investors gauged the impact of President Trump's tariffs on its decision making and the path of interest rates.

The recent optimism on Wall Street dissipated early Thursday as companies continued to reassess their financial outlooks due to uncertainty over U.S. President Donald Trump's on-again-off-again tariff policies.

The downbeat mood followed Monday’s retreat on Wall Street, where the S&P 500 snapped a rare nine-day winning streak — its longest since 2004 — with a 0.6 percent drop.

Wall Street's main indexes declined on Tuesday as investors tried to navigate the uncertainty surrounding U.S. President Donald Trump's tariffs, while awaiting the Federal Reserve's interest rate decision this week.

The Federal Reserve’s two-day meeting begins Tuesday, with the central bank widely expected to hold interest rates steady.