Prime Minister Justin Trudeau has vowed a "firm" and unwavering defence of Canadian interests in the face of US trade attacks.
"We're going to continue to work very, very hard to defend Canada's interests," he said yesterday.
In late April, the United States imposed a duty on timber imported from Canada and threatened similar sanctions on Canadian dairy products.
Then on Thursday, the US Department of Commerce launched an investigation at the request of aerospace manufacturer Boeing into alleged dumping of aircraft built by its Canadian rival Bombardier, with Canadian government financial support, into the US market.
On all of these issues, "we will always be resolute and firm in how we stand up for Canadian interests," Trudeau said.
"On the issue of aeronautics, we will always defend Canada's companies... And Canada's workers."
On Thursday, Foreign Minister Chrystia Freeland threatened to cancel Ottawa's purchase of Boeing fighter jets if the US did not back off its attacks on Bombardier.
US President Donald Trump has assailed the continental trade pact as "the worst trade deal maybe ever signed anywhere."
NAFTA negotiations between Canada, Mexico and the United States are to formally start in August after a 90-day consultation process.
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