Kirsten Hillman, Canada's ambassador to the U.S., said Monday that 99 percent of products traded between the two nations are tariff-free, as tensions escalate following President Trump's imposition of new tariffs and Ontario's retaliatory measures.

"Between Canada and the United States under the [U.S.-Mexico-Canada agreement], the deal that we negotiated under President Trump in his first term, Canada and the United States are 99 percent tariff-free," Hillman told NewsNation's "

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