US president Donald Trump has threatened to put higher tariffs on countries that want to "play games" after a key U.S. Supreme Court tariff ruling.
The US's highest court said that the levies imposed by Mr Trump last year based on a national emergency law were illegal.
In response, President Trump imposed a 15 percent tariff on global imports over the weekend and claimed that Congress had given him the power to use other kinds of tariff laws "in a much more powerful and obnoxious way, with legal certainty."
Kate Fisher report from Washington
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