U.S. stocks are drifting in mixed trading after the Federal Reserve left its main interest alone, as was widely expected, but also warned about rising risks for the U.S. economy

Wall Street is poised to open with gains as the Federal Reserve wraps up a two-day policy meeting where it will almost certainly leave interest rates unchanged despite pleas from President Donald Trump for a rate cut as he pursues a worldwide trade war.

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.