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U.S. President Donald Trump is in Japan for a four-day visit, which he began on Saturday. On the second day of his visit, he played a round of golf with Japanese Prime Minister Shinzo Abe. Abe and Trump then attended a sumo tournament. Trump is the first U.S. president to attend such an event. He'll meet with the new Emperor Naruhito on Monday. Afterward, Trump will meet with Abe and visit Yokosuka harbor.