Morneau said he is engaged in intense talks with his US counterparts in the hopes of finding a way forward.
Trump, in a Twitter tirade on Thursday, pointed fingers at Canadian Prime Minister Justin Trudeau and French president Emmanuel Macron, stating that "they are charging the US massive tariffs and create non-monetary barriers".
During his press conference on Saturday, Trump warned foreign countries not to retaliate against the U.S. tariffs.
The U.S. president would have been included in a G7 working session devoted to "climate change and clean energy" on the second day of the summit, officials had confirmed earlier this week.
U.S. President Donald Trump angered his G7 allies last week by slapping them with hefty tariffs on steel and aluminum - a move that prompted Canada and the European Union to threaten duties of their own.
Trump withdrew the U.S. from the Paris climate accord and his attendance of a G7 session on the issue was in question well into the last minute. "You got to go tariff free", he argued.
"With one country we have $375 billion in trade deficits".
Multi-state Salmonella outbreak connected to Walmart pre-cut melons
As we reported Friday , the outbreak has affected some 60 people in five states, including 32 in MI and 11 in Indiana. Those products have now been linked by officials to a rash of salmonella infections around the county.
Trump has said he'll use the summit to argue that the other six nations are taking advantage of the U.S. on trade. Prime Minister Justin Trudeau did not wait for the USA president to kick off the meeting in La Malbaie, Quebec.
"No tariffs, no barriers, that's the way it should be, and no subsidies", Trump said during a 30-minute press conference on the sidelines of the meeting in La Malbaie, Quebec.
G7 leaders had meant to use the summit to confront Trump on the tariffs, which they have described as protectionist and a threat to the global economy.
The EU said it will impose the "rebalancing" tariffs on about $3.3 billion (2.8 billion euros) worth of USA steel, bourbon, agricultural products including sweet corn, orange juice, cranberries and certain clothing made of cotton. The United States' closest trading partners - the EU, Canada and Mexico - have vowed to impose retaliatory tariffs on scores of U.S. products beginning in the coming weeks. The United States pays enormous tariffs on dairy.
Mr Trump said: "You know, whether you like it or not - and it may not be politically correct - but we have a world to run and in the G7, which used to be the G8, they threw Russian Federation out".
On Friday, French President Emmanuel Macron appeared to indicate room for negotiation ahead of a delayed meeting with Trump, telling reporters "Sometimes we disagree".
The communique said the leaders of the United States, Canada, Britain, France, Italy, Germany and Japan agreed on the need for "free, fair, and mutually beneficial trade" and the importance of fighting protectionism.
"President Trump is targeting the dairy sector because he wants to dump USA dairy into Canada", Lampron told The Canadian Press, adding that Canada imports five times more dairy from the US than it exports.