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FILE - In this April 7, 2017 file photo, President Donald Trump, left, and Chinese President Xi Jinping walk together after their meetings at Mar-a-Lago, in Palm Beach, Fla. China says President Xi has stressed the need for an end to North Korea's nuclear weapons program in a phone discussion with Trump that followed tweets from the U.S. president urging China to play a more active role. Xi told Trump that China insists on peace and stability on the Korean Peninsula and advocates resolving the problem through peaceful means. He said China would maintain "communication and coordination" with Washington over it. The two leaders spoke Tuesday night, April 11, 2017, Washington time. (AP Photo/Alex Brandon, File) (AP)

Personal diplomacy has long been a presidential tactic, but Trump adds a twist

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