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WASHINGTON – Canada is imposing dollar-for-dollar tariff “countermeasures” on up to $16.6 billion worth of U.S. imports in response to the American decision to make good on its threat of similar tariffs against Canadian-made steel and aluminum.

The tariffs, which apply to a long list of U.S. products that includes everything from flat-rolled steel to playing cards and felt-tipped pens, will go into effect July 1, Foreign Affairs Minister Chrystia Freeland told a news conference Thursday.

“This is $16.6 billion of retaliation,” Freeland said.

READ MORE: From pork to jeans — countries threaten tariff retaliation for U.S. steel, aluminum duties

“This is the strongest trade action Canada has taken in the post-war era. This is a very strong response, it is a proportionate response, it is perfectly reciprocal. This is a very strong Canadian action in response to a very bad U.S. decision.”

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Freeland made the announcement alongside Prime Minister Justin Trudeau following word from the White House that the U.S. will slap tariffs on Canadian, Mexican and European Union steel and aluminium as of midnight Thursday night.

WATCH: ‘No sign of common sense’ in decision to impose tariffs, Trudeau says

1:06 Trudeau: ‘No sign of common sense’ in decision to impose tarrifs Trudeau: ‘No sign of common sense’ in decision to impose tarrifs

She called the U.S. measures illegal and counterproductive, and both she and Trudeau expressed how hard it is to imagine how Canada could ever be a national-security threat to an ally as close and important as the United States.

“That Canada could be considered a national-security threat to the United States is inconceivable,” said Trudeau, adding that the people of the U.S. are not Canada’s target , and that the federal government would far prefer that its hand not be forced.

Canada, Mexico and Europe had been exempted from import duties of 25 per cent on steel and 10 per cent on aluminum when they were first imposed in March, but those exemptions will expire as scheduled on Friday.

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WATCH: Trudeau calls new tarriffs on steel, aluminum ‘totally unacceptable,’

0:41 Trudeau calls new tariffs on steel, aluminum ‘totally unacceptable,’ Trudeau calls new tariffs on steel, aluminum ‘totally unacceptable,’

“The government of Canada is confident that shared values, geography and common interests will ultimately overcome protectionism,” Trudeau said.

“We will always protect Canadian workers and Canadian interests.”

Commerce Secretary Wilbur Ross confirmed Thursday that the United States would end the temporary exemption on Canadian, Mexican and European Union steel and aluminum as of midnight, as scheduled.

READ MORE: U.S. announces steel and aluminum tariffs, Canada hits back

That means that President Donald Trump will be face to face with a number of leaders who have taken retaliatory action against the U.S. when he makes his closely watched Canadian debut at the G7 next week in Quebec.

While the tariffs have had “major, positive effects” on industry jobs and workers, “the Trump Administration’s actions underscore its commitment to good-faith negotiations with our allies to enhance our national security while supporting American workers,” the White House said in a statement.

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Canada, Mexico and Europe had been exempted until June 1 from import duties of 25 per cent on steel and 10 per cent on aluminum when they were first imposed in March. Barring an 11th-hour reprieve, those exemptions will expire as scheduled.

Ontario Premier Kathleen Wynne, campaigning in advance of the June 7 provincial election, savaged the U.S. president as she called the tariff measure short-sighted and urged Trudeau “to take the strongest retaliation possible to protect our workers” and industry.

“I think that we’ve all had just about enough of Donald Trump…. He doesn’t seem to get that his bluster and his bullying are costing people real jobs – in his own country, in Canada and in Ontario,” Wynne said.

WATCH: Chrystia Freeland calls new U.S. steel and aluminum tariffs ‘absurd’

1:51 Chrystia Freeland calls new U.S. steel and aluminum tariffs ‘absurd’ Chrystia Freeland calls new U.S. steel and aluminum tariffs ‘absurd’

“I really believe that now the time for talk is done. Donald Trump is a bully and the only way to deal with a bully is to stand up and push back and we have to do that.”

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During a conference call early Thursday, Ross shrugged off questions about the U.S. facing possible retaliation, or whether the move would negatively affect the G7 meeting. And he said that while he was looking forward to continuing negotiations, the U.S. is making its decision on national security grounds – a justification Foreign Affairs Minister Chrystia Freeland has dismissed as absurd.

In the case of Canada and Mexico, Ross said the decision was based on a lack of progress in the ongoing talks to update the North American Free Trade Agreement.

“As to Canada, Mexico, you will recall that the reason for the deferral had been pending the outcome of the NAFTA talks,” he said.

“Those talks are taking longer than we had hoped. There is no longer a very precise date when they may be concluded” so they were added to the tariff list, he said.

If Canada and Mexico choose to take retaliatory measures, it will not affect the ability to keep renegotiating NAFTA as a separate track, he added.

“If any of these parties does retaliate, that does not mean that there cannot be continuing negotiations,” Ross said. “They’re not mutually exclusive behaviours.”

The long-threatened tactic is sure to cast a pall over the G7, with some observers saying a G6-plus-one scenario is already shaping up, with Trump as the outlier.

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Ross played down the divisions.

WATCH: Wilbur Ross on steel tariffs: Countries ‘will get over this in due course’

2:19 Wilbur Ross on steel tariffs: Countries ‘will get over this in due course’ Wilbur Ross on steel tariffs: Countries ‘will get over this in due course’

“There are periodic disagreements between any two countries on any given set of topics. That doesn’t necessarily mean that it derails other discussions at all,” he said.

“It all depends on how the various parties react to the circumstances.”

European Commission President Jean-Claude Juncker, who will be at the G7 table with the seven other country leaders, expressed strong opposition to Thursday’s decision.

“The EU believes these unilateral U.S. tariffs are unjustified and at odds with World Trade Organization rules. This is protectionism, pure and simple.”

Trump had been widely expected to impose tariffs on European steel and aluminum imports after failing to win concessions from the European Union. Canada and its European allies have spent recent days making a concerted effort to head off the move.

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Trudeau and French President Emmanuel Macron made their cases separately Wednesday to dissuade Trump, who is using a national-security clause in U.S. trade law to justify the move. Trudeau and Macron will meet next week in Ottawa before the G7 to talk strategy.