Canadian Prime Minister Justin Trudeau will meet US President Donald Trump at the White House in the afternoon, with negotiations on the North American Free Trade Agreement underway nearby in the Washington suburb of Arlington, Virginia.
Trudeau's visit comes as US officials are seeking to impose retaliatory import duties on imports of certain Bombardier aircraft, claiming the Canadian government has unfairly subsidized them.
Ottawa in turn has threatened to cancel an order for 18 Boeing F/A-18 Super Hornet fighter jets.
"Thus far, we have made good progress, and I look forward to several days of hard work," Lighthizer said in a statement.
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The United States takes in three quarters of Canadian exports. But trade relations have been strained since Trump's inauguration earlier this year.
The American president has repeatedly threatened to scrap NAFTA, which established a free-trade zone between the Canada, the United States and Mexico in 1994.
In an interview with Forbes magazine published yesterday, Trump said he preferred bilateral trade agreements.
"I happen to think that NAFTA will have to be terminated if we're going to make it good," he told the magazine.
The talks to revise NAFTA began in mid-August. Three previous rounds have taken place with no major breakthroughs announced.
Following the most recent round in Ottawa last month, negotiators said they had made progress on subjects such as telecommunications, competition policy, digital trade, regulation and customs and trade facilitation.
The updated provisions on competition will allow for more "procedural fairness" in the enforcement of competition law, the statement said.
A major sticking point has been $64 billion US trade deficit with Mexico, which Washington wants to reduce or eliminate.
IMF Economic Counsellor Maurice Obstfeld warned yesterday that all three NAFTA countries faced economic consequences if the outcome of the talks ended up disrupting trade relations.
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