Wall Street's main indexes opened lower on Monday after President Donald Trump rekindled worries about the ramifications of a global trade war by introducing new tariffs, while focus remained on the Fed's monetary policy decision later this week.

The Dow Jones Industrial Average fell 144.1 points, or 0.35 per cent, at the open to 41,173.38. The S&P 500 fell 31.4 points, or 0.55 per cent, at the open to 5,655.32, while the Nasdaq Composite dropped 160.7 points, or 0.89 per cent, to 17,817.014 at the opening bell.

Trump announced a 100% tariff on movies produced outside the U.S. but offered little clarity on how the levies would be implemented. Movie and television production companies that film overseas fell in premarket trading.