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He also has strained relations with Canada, a close ally and major trading partner, by repeatedly threatening to annex the neighbouring country.
Canada’s finance minister Dominic LeBlanc said: “We will not stand idly by while our iconic steel and aluminum industries are being unfairly targeted.”
US commerce secretary Howard Lutnick said Trump would impose trade protections on copper as well.
Trump hits back
“It is not in our common interest to burden our economies with such tariffs,” she said.
China’s foreign ministry said it would safeguard its interests, while Japan’s chief cabinet secretary Yoshimasa Hayashi said the move could have a major impact on US-Japan economic ties.
The other countries most affected by the tariffs are Brazil, Mexico and South Korea, which all enjoyed some level of exemptions or quotas.