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.

Mexico has been preparing possible retaliatory tariffs on imports from the U.S., ranging from 5% to 20%, on pork, cheese, fresh produce, manufactured steel and aluminum, according