United States Trade Representative Robert Lighthizer (2L) shakes hands with China’s Vice Premier Liu He (2R) as US Treasury Secretary Steven Mnuchin (L) and China’s Commerce Minister Zhong Shan (R) at the Xijiao Conference Center in Shanghai on July 31, 2019. – US and Chinese negotiators agreed to meet again in the United States in September after holding “frank” and “constructive” talks in Shanghai on July 31, state media said following meetings overshadowed by a Twitter tirade from President Donald Trump. (Photo by Ng Han Guan / POOL / AFP) (Photo credit should read NG HAN GUAN/AFP via Getty Images)