The retaliatory measures include a 25% import tariff on steel products, 20% on pork products, 20% to 25% duties on cheeses and a 25% duty on bourbon.
Mr. Trump's chief economic adviser, Larry Kudlow, played down the feud at a White House briefing Wednesday.
"Communication lines are open", he said.
Trump has previously admitted to making a claim to Trudeau that he wasn't sure was true, insisting that the USA had a trade deficit with Canada. Washington has demanded that Beijing take steps to open its markets further to USA goods.
The EU came second at 14 percent, while Mexico ranked fifth with 5.4 percent of USA imports.
When it comes to pork and other porcine products, Mexico is the biggest importer of goods produced in the U.S.by volume, and pork producers in the country will now be subject to a tariff of 20 percent on a range of goods, including pork leg and shoulder, and ham, according to a Mexican presidential decree that announced the tariffs.
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Trump's antagonistic trade policies - and specifically the steel and aluminum tariffs - drew worldwide denunciation. He affirmed that President Trump would attend the G7 next week in Canada .
Apples are one of 71 USA products targeted by Mexico, which is also in talks with the United States and Canada to renegotiate the North American Free Trade Agreement.
Trump and Kudlow are traveling to Quebec this week for a meeting of leaders from seven of the world's leading economies, and several of those officials have expressed frustration at Trump for his protectionist approach to trade.
The comments in the White House press briefing room came shortly after both Canadian Prime Minister Justin Trudeau, who is hosting the G-7 summit in Quebec's Charlevoix region, and German Chancellor Angela Merkel forecast hard discussions on Friday and Saturday.
According to the sources, Trudeau pressed Trump on how he could justify the tariffs as a "national security" issue.
The package would include increased purchases of US soybeans, corn and other agricultural goods.
Expectations for a resolution of the trade row this week are low after finance leaders from the United States' G7 partners butted heads with U.S. Treasury Secretary Steven Mnuchin at a meeting last week in the Canadian resort town of Whistler, British Columbia.
Canada hits United States with billions in retaliatory tariffs in steel row
Trump has vowed to press ahead with tariffs on as much as $50 billion in imports from China. "This is a bad day for world trade". President Trump said the United States had been unfairly treated in trade with its neighboring and oversees partners.
The statement, the official added, would accept no language about Iran not respecting the terms of the nuclear accord or any condemnation of the agreement.
Another factor was British support for Native Americans as they fought against the U.S. government's westward expansion.
German Chancellor Angela Merkel previewed the dynamics on Wednesday, telling the German parliament that "it is apparent that we have a serious problem with multilateral agreements here, and so there will be contentious discussions".
Trump defended his decision on tariffs on Canada and other U.S. allies in a tweet over the weekend.
Of course, Trump's history was a little off as the White House was set ablaze on August 24, 1814, and Canada didn't become a country until 1867.
"We may have tactical disagreements, but he has always said - and I agree - tariffs are a tool in that effort".
The G7 groups Canada, the United States, Japan, Britain, Italy, France and Germany.
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Serena Williams has pulled out of the French Open ahead of her match with Maria Sharapova , citing a pectoral muscle injury. He added: "If she had played and been unable to serve normally, she would have risked making the injury much worse".
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