Trump says he has not spoken with Russian President Vladimir Putin in a while.
His comments follow his administration slapping Canada with hefty fines, as Ottawa looks to implement its own levies on American products starting Jul. 1.
They also stepped up Trump's assault on Trudeau himself - unprecedented in the neighbouring countries' longstanding relationship.
The G7 summit is bringing together world leaders to discuss economic growth, gender equality and other issues.
Image copyright JESCO DENZE What was agreed?
"We strive to reduce tariff barriers, non-tariff barriers and subsidies", the statement said.
"The prime minister said nothing he hasn't said before - both in public and in private conversations with the President", said spokesman Cameron Ahmad.
Sen. Dianne Feinstein, California Democrat, said it's one thing for Mr. Trump to get angry, but quite another to ditch the agreement. "While sending their product into our country tax free. We're like the piggy bank that everybody is robbing and that ends".
But the summit host, Trudeau, whose nation was among those singled out by Trump, pushed back and said he would not hesitate to retaliate against his neighbor to the south.
G7 to fight protectionism, Trump threats
Asked Saturday about his meetings with other world leaders, Trump sought however to downplay the tension. He was positioned between Canadian Prime Minister Justin Trudeau , who has called Mr.
The President, who left the summit early to head for his talks with North Korean leader Kim Jong Un, said the United States needed protectionist tariffs because "we are like the piggy bank that everyone is robbing".
Mr Trump earlier warned his counterparts against retaliation after the USA imposed tariffs on steel and aluminium from Europe, Mexico and Canada - saying they would be "making a mistake".
Trump earlier had criticised India over high tariffs on Harley- Davidson.
In the communique, the G7 said it planned to take action against Russian election meddling in Western countries. Does Trump mean to target those exports, or is he actually trying to undermine Canada's supply management system?
The US president has made it clear he believes the removal of tariffs against his G7 allies should come at a price - and he doesn't expect the US to pick up the tab. "This isn't just G7".
"The rhetoric has far outpaced the implementation", said Geoffrey Gertz, trade analyst with Brookings think tank in Washington.
In the run-up to the G7 summit, United States relations with the most of the remaining G7 countries have deteriorated, since Washington removed an exemption on 25 percent tariffs for steel and 10 percent for aluminum from Canada, Mexico, and the European Union, which prompted the bloc and Canada to roll out retaliatory measures. Issues such as gender equality and climate change will be major topics of discussion, particularly in light of the USA withdrawal from the Paris agreement.
Led by the U.S., the group kicked out Russian Federation in 2014 over its annexation of Crimea and its support for pro-Russia separatists in Ukraine.
France's President Macron also shared another view, with him arguing forcefully with his hands in Mr Trump's direction.