"These unilateral tariffs, imposed under a false pretext of safeguarding US national security, are inconsistent with the United States' global trade obligations and WTO rules", Chrystia Freeland, Canada's minister of foreign affairs, said in a statement.
Malmstrom said that specific retaliatory measures would be submitted to the World Trade Organization by June 20.
Since Trump took office in 2017, Trudeau has attempted to work with his American counterpart to find an amicable agreement on the North American Free Trade Agreement despite Trump's harsh rhetoric.
Prime Minister Justin Trudeau and Foreign Affairs Minister Chrystia Freeland speak at a press conference in Ottawa on Thursday, May 31, 2018. It is the top buyer of USA aluminum and the second-biggest buyer of US steel, Guajardo's ministry said.
Some of Trump's fellow Republicans also criticized the move.
"We will keep fighting", Turner said. "From the beaches of Normandy to the mountains of Afghanistan, we have fought and died together", Trudeau told moderator Chuck Todd.
Trudeau wrote on Twitter: "American tariffs on Canadian aluminum & steel are unacceptable".
"We talked about how hard this was going to be in terms of a turning point in the Canada-U.S. relationship", Trudeau noted.
French Finance Minister Bruno Le Maire warned of the consequences, saying: "It's entirely up to U.S. authorities whether they want to enter into a trade conflict with their biggest partner, Europe".
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At the Group of Seven ministerial meeting in Canada, US Treasury Secretary Steven Mnuchin faced stern reactions from his counterparts, who accused Trump of jeopardizing the world economy with steps that would prove job killers for all concerned. "In this case, it is simply a response to a first action", Guajardo told Mexican radio.
Both Ambrose and Heyman said they worry the tariffs are an indication Trump doesn't want to see a deal on NAFTA reached, and rather the entire dance has been about political gain for the U.S. President.
Trudeau, meanwhile, calls it "inconceivable" that Canada could ever be a national-security threat to an ally as close and important as the United States.
The new 25 percent tariff on steel imports and 10 percent tariff on aluminum imports from the EU, Canada and Mexico come into force at midnight (04:00 GMT, Friday), according to US Commerce Secretary Ross.
"They chose not to offer a reasonable quota, and we had to put the tariffs on", he said.
"Donald Trump's haphazard and reckless plan to impose tariffs on Canada and the European Union is an absolute disaster that will cause unnecessary economic pain to farmers, manufacturers and consumers in Vermont and throughout the country". It's illegal. It's immoral.
Trump campaigned on a pledge to rewrite trade agreements and crack down on China, Mexico and other countries.
"It all depends on how the various parties react to the circumstances".
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"These tariffs are a new US$347 million tax on the USA beer industry", CEO Jim McGreevy said in a statement.
Mexico's ministry of economy pledged to impose equivalent measures, and included a partial list of USA goods that would face tariffs, including pork bellies, cheese, and produce such as grapes and apples.
"I think that we've all had just about enough of Donald Trump".
Asked what Canada's plan is if the US swipes at Canada again, Freeland said the federal government is "ready for anything... ready for any and every eventuality".
"I really believe that now the time for talk is done". "This is the way we get back to the table".
But one Canada-watcher in Washington stressed there was no need for Canada to take Thursday's decision personally.
But Commerce Secretary Wilbur RossWilbur Louis RossHarley warns of hit to sales as European Union moves to retaliate against Trump's tariffs Trade wars don't appear to be the easy wins we were promised Trump defiant on tariffs, touts job numbers MORE said that trade talks had not advanced far enough to warrant a continued exemption.
"This is Trump versus the world, rather than Trump versus Canada".
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