FILE - In this Feb. 15, 2019, file photo, Chinese Vice Premier Liu He, right, talks with U.S. Trade Representative Robert Lighthizer, while they line up for a group photo at the Diaoyutai State Guesthouse in Beijing. China's economy czar is going to Washington for talks Thursday and Friday aimed at ending a tariff war over Beijing's technology ambitions.(AP Photo/Mark Schiefelbein, File)