The tariffs add a new front to a trade war largely driven by Donald Trump's announcement of tariffs on Canada, Mexico and China and threats of protectionist measures on other nations.

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Beijing, which set steep duties on canola, peas and pork, wants Canada and Mexico to resist U.S. pressure to raise tariffs on Chinese goods.

The president has launched a trade war seeking to quell the flow of illegal immigrants and the illegal trafficking of drugs and rebalance trade.

"Tariffs are now in effect for certain goods from Mexico, Canada, and China — now the big question is how soon families could see changes.

China on Saturday announced retaliatory tariffs on some Canadian farm and food imports, after Canada imposed duties in October on Chinese-made electric vehicles and steel and aluminum products.

Canadian farmers could take a big hit from China's sudden retaliatory tariffs that take aim at canola, pork and other food commodities.