"It's going to stop, or we'll stop trading with them", the president said at a news conference on the second day of the G7 summit in Quebec.
US President Donald Trump's attempt to overthrow or renegotiate a series of worldwide agreements constitutes a threat to the post Cold War order, European Union president Donald Tusk warned on Friday.
Trump will skip part of the summit on Saturday as he travels to Singapore to meet with North Korean dictator Kim Jong Un in hopes of resolving the North Korean nuclear crisis. "With that being said, I think we'll probably very easily make a deal".
Trump says they will either have a better agreement on NAFTA or two deals involving separate trade deals with Canada and Mexico.
The G-7 was referred to as the G-8 before Russian Federation was expelled as punishment for its annexation of Crimea in 2014.
Trump is scheduled to address the USA news media at 10 a.m. EDT on Saturday. "Our Tariffs are in response to his of 270% on dairy!" the USA president tweeted.
"You know, whether you like it or not - and it may not be politically correct - but we have a world to run", Trump said.
And the traditional "family photo" - featuring UK Prime Minister Theresa May, German Chancellor Angela Merkel, US President Donald Trump, Canadian Prime Minister Justin Trudeau, French President Emmanuel Macron, Japanese Prime Minister Shinzo Abe, and Italian Prime Minister Giuseppe Conte - offers a glimpse of the tension.
And more: "Looking forward to straightening out unfair Trade Deals with the G-7 countries".
The series of snubs and demands from Trump - in combination with other long-simmering disagreements with key USA allies - prompted speculation that the US would be left out of the joint communique with the other G-7 leaders. "I think it will be very positive", Trump said on Friday, without giving details.
Trump, who repeated that his tariffs are meant to protect US industry and workers from unfair global competition, told reporters he had suggested to the other G7 leaders that all trade barriers, including tariffs and subsidies, be eliminated.
The President warned Canada and Europe to back off their threats to hit back with retaliatory trade measures on July 1 if the US does not lift the steel and aluminum levies.
Trudeau has worked hard to find common ground with the unpredictable president, but the personal bond he has tried to forge has been strained.
Trudeau and the other G7 leaders used their meeting to try to persuade Trump to abandon the tariffs, which affect all of America's G7 allies.
President Donald Trump is delivering a statement from the Group of Seven summit in Quebec, saying he had a successful set of meetings in which he discussed the need for "fair and reciprocal" trade and ways of addressing the threat of Iran.