President Trump and Japanese Prime Minister Shinzo Abe at Akasaka Palace in Tokyo on Monday. Evan Vucci/AP hide caption The optics and the rhetoric of President Trump’s state visit to Japan aimed to show two allies at their closest in history, at the start of a new Japanese emperor’s reign. Trump is the first state guest to visit since Emperor Naruhito ascended the Chrysanthemum Throne on May 1. On Sunday, he and Japanese Prime Minister Shinzo Abe shared a round of golf, attended a sumo wrestling match and had a barbecue dinner. But on Monday, a joint press conference with the two leaders revealed the two countries struggling to manage differences over a raft of policy issues — in particular, bilateral trade, North Korea and Iran. President Trump walks with Japanese Prime Minister Shinzo Abe before playing a round of golf on Sunday in Shiba, Japan. Evan Vucci/AP hide caption President Trump walks with Japanese Prime Minister Shinzo Abe before playing a round of golf on Sunday in Shiba, Japan. One of Japan’s top concerns is that the U.S. is threatening tariffs on Japanese car exports to the U.S. if a deal is not reached in six months. Those exports are a mainst...