BUENOS AIRES, Argentina — Canadian Prime Minister Justin Trudeau is calling on President Donald Trump to remove tariffs on steel and aluminum.

Trudeau issued his plea as he joined Trump and Mexican President Enrique Pena Nieto this morning to sign the U.S.-Mexico-Canada Agreement, successor to the North American Free Trade Agreement.

There was talk Trudeau would skip the signing over the tariffs. But he attended and used his remarks to declare the tariffs a major obstacle to their economies. He says the U.S. and Canada need to keep working toward lifting the levies.

Trump enraged Canada and other U.S. allies by declaring imported steel and aluminum a threat to America's national security and therefore a legitimate target for U.S. tariffs.

Trudeau says the new trade deal is a major step for Canada's economy.

Trump has long raged against NAFTA. He says the new agreement "changes the trade landscape forever."

Lawmakers in each country must now ratify the agreement.

That could prove to be a difficult task in the United States, especially now that Democrats will control the House of Representatives come January. Already Democrats and their allies in the labor movement are demanding changes.

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