(Reuters) -The S&P 500 and the Nasdaq were lower on Monday after U.S. President Donald Trump rekindled worries about the fallout of a global trade war by introducing new tariffs, while focus remained on the Federal Reserve's monetary policy decision later this week. On Sunday, Trump announced a 100% tariff on movies produced outside the U.S. but offered little clarity on how the levies would be implemented. Several movie and television production companies took a hit.
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