The statement on the call said Trump had emphasized "quickly concluding" the NAFTA negotiations. Since most tariffs are already low, affected countries are allowed to impose their own tariffs on U.S. goods and services but only for three years.
In signing the order last week, the President made it clear that if Canada and Mexico made concessions during the NFTA negotiations, they would be exempted from the tariffs.
Canada, the biggest supplier of steel and aluminum to the United States, escaped Trump's import duties along with Mexico, but the two countries could still face duties if they fail to reach a deal with the Trump administration modernizing the North American Free Trade Agreement.
Canada has been particularly recalcitrant in making any concessions on its dairy policy, a key issue for the USA where dairy producers are suffering economically.
"That is a concern that we share with the Americans and we're going to keep ensuring that Canadian steel is Canadian steel", Trudeau said before shaking hands and taking selfies with the assembled steelworkers.
She is to meet US Trade Representative Robert Lighthizer, Commerce Secretary Wilbur Ross, Congressional leaders and others.
Trudeau's view has prominent support: A poll of leading economists from the University of Chicago has found rare unanimity on the topic, with a newly released survey Monday showing that zero per cent of economists surveyed believe tariffs will help Americans.
In a letter submitted to President Donald Trump, the Auto Care Association urged the administration to reconsider imposing tariffs on imports of steel and aluminum due to unintended negative consequences it may have on the US economy and the auto care industry.
There's no question steel is an essential part of a wide range of weapons and other goods used by the military, from tanks to battleships. So that whole issue of national security is off the table.
The prime minister is on a cross-country tour of aluminum and steel factories to demonstrate his government's support for workers in light of potential threats to those industries from the USA administration.
"We are ready to take action whenever action is required. we had your backs last week and we always will", Trudeau said after visiting a Rio Tinto Ltd (RIO.AX) (RIO.L) smelter in Alma, Quebec, his first stop on a tour this week of Canada's steel and aluminum regions.
28% of the volume of steel from Dofasco is exported to the United States, which would mean large impacts on the company if the tariffs are imposed. Marie, Ont., and Regina, Sask.
Canadian Prime Minister Justin Trudeau on Monday said he expects Canadians in the center of the steel industry can "breathe a sigh of relief" as trade talks continue between NAFTA members.