In this Dec. 1, 2018, photo, President Donald Trump, second from right, meets with China's President Xi Jinping, second from left, during their bilateral meeting at the G20 Summit, in Buenos Aires, Argentina. China promised Wednesday, Dec. 5, 2018, to carry out a tariff cease-fire with Washington but gave no details that might help dispel confusion about what Presidents Xi and Trump agreed to in Argentina.(AP Photo/Pablo Martinez Monsivais, File)