Numerous products targeted are produced by exporters in states that are politically important to United States President Donald Trump.
Further complicating the US relationship with Canada is the ongoing effort to renegotiate the North American Free Trade Agreement, with both leaders saying they are willing to walk away from the pact if talks fail to produce a revised agreement to their liking.
Canada has also rejected "for now" a proposal floated by the White House for new separate USA trade deals with Canada and Mexico.
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".
Pierre Lampron, president of the Dairy Farmers of Canada, said in a letter to Trudeau Monday the prime minister's comments were "quite worrisome", and "deeply troubling for our dairy farmers", given repeated pledges of support by Trudeau and his lawmakers for the sector. The White House backed the bill earlier this year. "The president is at ease with all of these tough issues".
Trudeau has publicly denounced the "national security" justification for the new tariffs.
Angela Hofmann, deputy director of Farmers for Free Trade, said the tariffs will exact immediate and painful consequences on US farmers and the domestic economy.
"And I would just say to all of Canada's American friends - and there are so many - seriously?"
British Prime Minister Theresa May called Trump's tariffs "unjustified" and Trudeau said the national security rationale for imposing them was "insulting and unacceptable".
The European Union and Mexico struck back President Donald Trump's trade threats, and the two countries appear to be trying to send a message with their retaliation.
Prime Minister to address global celebrations of World Enviroment Day
Around half of all plastic consumed is single use, meaning it immediately becomes waste if not recycled. It is only then that we can unite to eradicate the plastic pollution that prevails in the society.
For example Mexico is the largest market for United States pork exports according to the National Pork Producers Council, an industry trade group.
While trade is expected to dominate, Trudeau also wants to focus on gender equality and climate change.
The economy and trade will be the first topic discussed at the two day meeting, and could disrupt work on other key initiatives.
Based on the resolution of past disputes and long-standing relationships with retail and wholesale customers, Ratia believes his company and others in the apple industry can weather this latest trade setback. It was one of the most controversial NAFTA proposals. Trump responded with a puzzling- and erroneous -question about Canadian history.
The increasingly critical tone from allies is a shift after leaders spent the past year and a half seeking to woo and cajole the American president.
"We have heard nothing", she said.
But Wright added: "There is a feeling, I think, over the last few months, that that approach has not borne fruit, and that they haven't really gotten anything for that friendly approach".
The remarks underscore the differences between Trump and his fellow G7 leaders over the usefulness of the global multilateral world order, something Trudeau and the other world leaders are struggling to defend.
Red Delicious apples have fallen out of favor with US consumers, but they're still popular in Mexico.