"These tariffs are an affront to the long-standing security partnership between Canada and the United States, and in particular, an affront to the thousands of Canadians who have fought and died alongside their American brothers in arms", he said, noting the U.S. national security justification for its measures.
"Were the United States to be successful it sets a precedent for others do the same and to use national security as pretext for protectionism, and secondly, it leads the WTO into the realms of having to determine what is and what is not acceptable as a definition for national security, something the WTO has always shied away from".
Galimberti noted that there are tariffs on Canadian exports of steel and aluminum to the US but nothing yet on American exports entering Canada, even as producers in this country begin to feel the bite of Washington's trade measures.
Canada responded last week by saying it would slap 25 per cent tariffs on a slew of US steel imports and a 10 per cent taxes on aluminum imports as well as dozens of American consumer goods from orange juice to sailboats to whisky.
Steel industry executives, who met with Mr. Trudeau Monday afternoon, are also asking the Liberal government to throw up safeguards to block foreign steel diverted from the US market from being redirected into Canada.
Kudlow said Trump had been responding to "several decades of trade abuses" with the tariffs, but noted that the White House announcement said the United States still would welcome good-faith negotiations.
Speaking in the House of Commons earlier however, the global trade secretary, Liam Fox, said he hoped once the United Kingdom had left the European Union, "we'll have no problems with a United Kingdom exemption".
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The EU is set to retaliate with tariffs on a range of US goods from Harley-Davidson (HOG.N) motorcycles to blue jeans and bourbon whiskey.
Economists, trade experts, and investors are all anxious that President Donald Trump's recent tariffs could be a problem for the USA economy. And on Friday, Trump said he "wouldn't mind" scrapping the North American Free Trade Agreement.
President Donald Trump's administration last week imposed US tariffs of 25 percent on steel and 10 percent on aluminum from Canada - the No. 1 steel exporter to the United States - as well as on Mexico and the European Union.
"Despite the strong incentives to avoid a trade war with the [United States], China can not tolerate the perception that it has yielded to USA demands", analysts at investment bank Nomura said in a research note Monday. "You don't sign a trade deal that automatically expires every five years".
Some members of Congress are objecting to the executive authority Trump wants to use to punish trading partners for imbalances he says hurt American workers. May will not push for a United Kingdom exemption to the new U.S. border tariffs of 25% on EU imports of rolled steel and 10% on aluminium as the United Kingdom will join the bloc's push for European exemption.
"There are better ways to help American workers and consumers".