"We are very concerned about the actions taken by China and the dumping of steel and aluminum on the global market", Trudeau said following a tour of an aluminum plant in Quebec.
Workers in both the aluminum and steel industries face uncertainty over new tariffs. Mr. Trump has exempted Canada and Mexico from the tariffs while NAFTA is being renegotiated.
The steel tariff threat was seen by many to be an attempt by the Trump administration to pressure Canada and Mexico to complete the NAFTA talks - giving in to other US demands or giving up some of their own -rather than risk the punishing steel and aluminum duties.
"There is a global overcapacity issue and we are very pleased to work with our allies and friends to continue to counter that problem", he said.
President Donald Trump spoke on Monday with Canadian Prime Minister Justin Trudeau about the steel and aluminum import tariffs Trump announced last week, the White House said.
"There is no national security argument to be made against Canada", Trudeau said.
Canada and Mexico will be temporarily exempt but there is concern the measure could be reversed.
Lawrence Valley and the Great Lakes, to the ports of the east and west coasts and urban centres across the country, Canada's steel and aluminum industries provide thousands of Canadians with good, middle class jobs and play an important role in our economy.
Trudeau's dumping accusations against Beijing, which echoed Trump's own message, come after exploratory talks with China failed to advance to Canada-China free trade negotiations.