U.S. President Donald Trump and Chinese Vice Premier Liu He, who is also a member of the Political Bureau of the Communist Party of China Central Committee and chief of the Chinese side of the China-U.S. comprehensive economic dialogue, leave the East Room of the White House after signing the China-U.S. phase-one economic and trade agreement in Washington D.C., the United States, Jan. 15, 2020. (Xinhua/Liu Jie)