Trudeau has denounced the "national security" justification for the new tariffs.
The Trump administration used an old trade law from 1962 to justify the tariffs as a national security issue.
The White House was burned by British troops in 1814 as part of a failed invasion of the mid-Atlantic, more than 50 years before the signing of Canada's confederation paved the way for the country to become independent. Canada announced its own list last week, and the European Union said it would do so too later in June.
Mexico said it would impose import duties on $3 billion worth of US products, including cheese, bourbon, pork and others, making good on its threats that it would retailiate for USA tariffs on steel and aluminum.
Mexico promised retaliatory measures after the US announced it would go forward with its plan to impose steel and aluminum tariffs.
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.
The border between the United States and Canada has been demilitarized for two centuries.
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"His preference now, and he asked me to convey this, is to actually negotiate with Mexico and Canada separately", he told Fox News Tuesday.
White House economic adviser Larry Kudlow gives a press briefing about upcoming G7 in the White House in Washington, U.S., June 6, 2018.
The United States is reportedly preparing to unleash another round of tariffs on Canada as retribution for its Can$16.6 billion (US$12.9 billion) in tariffs on USA goods.
"If the numbers are accurate, an additional $70 billion in USA exports to China would be considerable - a 50 percent increase in US exports from 2017 levels", Chad Bown, a senior fellow at the Peterson Institute for International Economics, said in an email. So why would the Trump administration be willing to start a trade war with the United States' most important trading partners - as well as some of its oldest allies?
The tariffs, meanwhile, have further complicated the U.S. The Trump administration has held out the possibility of scrapping the treaty entirely and negotiating bilateral trade agreements, something both Canada and Mexico oppose. "That Canada could be considered a national security threat to the United States is inconceivable".
Despite the G7's efforts to coax the Trump administration away from a go-it-alone approach, some analysts now question whether Washington remains committed to basic policies that have upheld the post-World War Two global economic system.