The aerospace firm was accused of anti-competitive practice by rival Boeing, which complained to the USA authorities.
"We won't do business with a company that's busy trying to sue us and put our aerospace workers out of business", Mr. Trudeau said on September 18 in a joint news conference with Prime Minister Theresa May of Britain. Ms.
The preliminary decision came after complaints by rival aerospace multinational Boeing, which argued that Bombardier received unfair state subsidies from the United Kingdom and Canada, allowing the sale of airliners at below cost price in America.
Quebec Premier Philippe Couillard says he wants Ottawa to take a hard line against Boeing after the U.S. Department of Commerce proposed a hefty 219 per cent countervailing duty on jets manufactured by Montreal rival Bombardier.
"Bitterly disappointed by initial Bombardier ruling".
The UK government and trade unions fear the ruling could put the jobs of 4,100 staff in Northern Ireland at risk.
"This is not the behavior we expect from Boeing and it could indeed jeopardize our future relationship with them", Mr. Fallon said.
George Burnside, a senior steward at Bombardier Belfast, said fear of what the ruling may hold was stalking the work floor but the final ruling on punitive charges could be made in the U.S. in February. Experts said the Canadians could technically import the jets itself through a local subsidiary in a way that would be neutral for Delta.
Government and business must work in partnership to deliver a new far-reaching industrial strategy to improve regional resilience, economic competitiveness and facilitate growth.
Bombardier employs more than 4,000 people in Belfast and contributes an estimated £400m (€457m) to the Northern economy.
Bombardier responded by saying its products are "superior".
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Ulster Unionist East Belfast MLA Andy Allen called on the UK Government to send a clear and uncompromising message to Boeing that other contracts could be reconsidered in the UK.
"Boeing stand to gain a lot of British defense spending".
"The U.S. values its relationships with Canada, but even our closest allies must play by the rules", said Secretary Ross.
Mrs May has lobbied US President Donald Trump over the dispute, and raised it in talks with Canadian Prime Minister Justin Trudeau on a visit there last week.
The scale of the tariff was higher than what Boeing had sought, and Bombardier could be hit by even more tariffs as the regulatory process continues.
"There are further steps that will follow", she said in a statement.
Quebec Finance Minister Carlos Leitao, whose government invested US$1 billion for a 49.5 per cent stake in the CSeries commercial jet program past year, said he was confident that Bombardier would beat Boeing.
The UK government has contracts with the American aerospace firm in the hundreds of millions of pounds.
The company is the cornerstone of the manufacturing sector in Northern Ireland, both as the largest employer and enabler of a wider engineering supply chain.
An global trade dispute with major implications for jobs in Northern Ireland is unjustified and unwarranted, the British Government said.
The Montreal-based manufacturer said Boeing was "seeking to use a skewed process to stifle competition and prevent USA airlines and their passengers from benefiting from the CSeries".