04/30/2018 14:33 EDT | Updated 04/30/2018 14:33 EDT

Canada Hopes For Exemption As Trump's Steel, Aluminum Tariffs Deadline Arrives

"There's no jurisdiction on the planet that has a better case for a full exemption than Canada."

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US President Donald Trump speaks during a meeting with Nigeria's President Muhammadu Buhari in the Oval Office of the White House in Washington, D.C., on April 30, 2018.

WASHINGTON — The United States was keeping its trading partners in suspense Monday, with steel and aluminum tariffs scheduled to snap into effect at midnight barring any new announcement.

Canada has particular reason to be watching closely: it's the No. 1 supplier of both materials to the U.S.

Canada is hoping to win another exemption, along with Mexico, as all three countries continue their efforts to negotiate changes to the North American Free Trade Agreement.

Tariffs were previously scheduled to hit weeks ago, but President Donald Trump issued orders delaying them until May 1. A White House official says the only thing that could stop them again is a new presidential order.

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U.S. President Donald Trump arrives to speak at a Make America Great Again Rally in Washington, Mich.

"Absent any additional presidential proclamation, all tariffs would go into effect at midnight,'' the official said.

"So in order for the exemptions to be extended or made permanent, a new proclamation would have to come from us like the original ones did.''

Canada's position is that neither tariffs — nor the alternative of quotas — makes economic, legal or military sense. Trump's legal justification for such tariffs is that reliance on foreign metals threatens American national security.

Watch: The US, Mexico, And Canada Quietly Make Progress On NAFTA Negotiations

Canada has argued that it has been supplying metals to the U.S. military for generations, that its imports and exports of steel are balanced, and that it is working with the U.S. to keep over-produced Asian steel out of North America.

It's also unclear how tariffs would affect the heavily integrated auto industry, where the same piece might criss-cross the border multiple times.

''There's no jurisdiction on the planet that has a better case for a full exemption than Canada,'' said Joseph Galimberti, president of the Canadian Steel Producers Association.

''We source our raw material from the U.S. We do extensive business with the U.S. We have comparable costs (on salaries). We are in no way, shape, or form unfair trade... There's not a hint that we do anything along the lines of state subsidies... We have been their partner in addressing global overcapacity...

''I could go on and on and on.''