Following through on a threat made after he won the presidency, Trump on Saturday imposed a blanket 10% levy on China, and 25% duties on both Canada and Mexico, over their alleged failure to prevent undocumented migrants and illegal drugs pouring into the US.

China's sharpest pushback on Sunday was over fentanyl, an area where the Biden administration had also been urging Beijing to crack down on shipments.

U.S. President Donald Trump warned on Monday he might increase tariffs on China beyond the 10% he imposed on Saturday and that "we will speak to China" probably over the next 24 hours. He described the tariffs he placed on Chinese imports as an "opening salvo" in his drive for more balance in the U.