"Already, farmers are grappling with the impact of previous tariffs, which have caused falling commodity futures, higher equipment prices, and the markets they've fought to get into for decades to vanish overnight", he said. Macron seemed resigned to that prospect, noting Trump had not signed a recent G20 declaration on tackling global warming.
"The toll on rural America from escalating trade disputes with critically important trade partners is mounting".
The Trump administration's steel and aluminum tariff gains may mean financial pain for Tyson Foods and other USA pork processors.
The escalating trade tension has prompted concern from USA business sectors that face financial hits. "But no one lives for ever", Macron responded.
"As I highlighted to the president, Air Force One is going to be arriving at Bagotville, at an air base that was created to protect the aluminum industry that the North American and American war effort was so dependent on in the Second World War", Trudeau said. He acknowledged the questions that swirl about the "dynamic" at the summit.
"We want a trilateral agreement-we've always said this", said International Trade Minister Francois-Philippe Champagne.
"I didn't pay much attention to the quip; I focused on the message I was putting out, which was that it is inconceivable - and quite frankly insulting - that the United States considers Canada to be a threat to national security".
"For better or worse, Mexico has become as much dependent on the USA for the pork that it feeds its people as the United States has become dependent on Mexico", said Altin Kalo and agricultural economist with Steiner Consulting Group in Manchester, New Hampshire.
While the U.S.is awash in stellar economic news, the best Canada can do is beat its own analyst's bad forecasts.
US senior economic adviser Larry Kudlow played down his country's trade dispute with Canada, and said he hoped Trump and Trudeau could work through their differences during their face-to-face meeting at the summit, which opens Friday.
China warns trade deals off if USA imposes tariffs
Ross is "going there to tread water", the person said, declining to be identified due to the sensitivity of the matter. Before the establishment of the federal income tax in 1913, tariffs were a big money raiser for the US government.
In retaliation for the Trump administration announcing tariffs on steel and aluminum imports from Mexico and much of the rest of the world, Mexico Tuesday imposed a series of tariffs against United States exports to its market valued at $3 billion.
Macron said he's faced criticism that he's been too friendly with the US president.
Many locals say people in the region, where several generations of families have worked in aluminum production, are anxious the uncertainty caused by the tariffs could eventually lead to job losses - on both sides of the border.
Still, the French president revealed that he's tried to change Trump's positions on climate change and trade. "I think the president has made that very clear".
"Communication lines are open", he said.
Ministers from Germany, France and Britain have already written to USA officials urging them to shield European companies working in Iran from getting caught up in Washington's new sanctions on Tehran.
Trump withdrew from the Joint Comprehensive Plan of Action initially signed between Iran and a group that included China, Russia, France, Germany, the U.K. and the United States.
The Trump administration has threatened to impose sanctions against European companies that continue to do business with Tehran, an effort the USA has said it will resist. "We can't engage in a trade war against friends", Mr. Macron said.
Both Macron and Trudeau went out of their way to stress the close ties between their own countries.
"Canada's a different country than Mexico".