Under an unrelenting sun at the Imperial Palace in Japan, President Donald Trump made history and became the first world leader on Monday to meet the new emperor of Japan.The president, who is on a four-day visit, was the center of attention at a large outdoor welcome ceremony where he made an individual walk and reviewed the Japanese troops as the guest of honor.Trump's "state call" opened with a greeting and a handshake with Naruhito, who ascended the throne on May 1, and his wife, Empress Masako.When he approached...