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.

World shares were mixed on Wednesday as the Federal Reserve prepared to wrap up its policy meeting with virtually everyone expecting it to keep interest rates unchanged despite President Donald Trump's calls for it to cut borrowing costs.