A fourth round of talks to revamp a landmark North American trade agreement will begin today in the Washington suburb of Arlington, Virginia, amid tensions between the United States and Canada over a trade dispute involving Bombardier aircraft. Canadian Prime Minister, Justin Trudeau will meet US President Donald Trump at the White House today to discuss the issue. <br/><br/>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. Canada in turn has threatened to cancel a multi-billion-dollar order of 18 Boeing FA-18 Super Hornet fighter jets. Mr. Trump has repeatedly threatened to scrap North American Trade Agreement (NAFTA), which established a free-trade zone between the Canada, the United States and Mexico in 1994. Meanwhile, Mexico has said ending NAFTA would break relations between Mexico and the US. Speaking before a new round of trade talks, Mexican foreign minister, Luis Videgaray said ending the regional trade agreement would affect the relations between the US and Mexico and damage their co-operation on other issues such as addressing the issue of drug-trafficking and stopping illegal immigration across the US's southern border.