"We're like the piggy bank that everybody is robbing", he said at a press conference before making an early exit from the two-day summit in La Malbaie, Quebec, where he met with leaders of Canada, Britain, France, Italy, Germany and Japan.
That communiqué contains commitments on exchanging approaches for fair tax systems and fighting tax evasion, fighting protectionism, reducing trade barriers, establishing strong health systems, promoting growth in developing economies, and ending sexual and gender-based violence, among other issues.
Shortly after Mr. Trudeau said that he was "happy to announce that we have released a joint communique by all seven countries" indicating that the U.S. was also included, Mr. Trump announced that Washington would reverse its decision and not sign the statement.
Japan: The U.S. trade deficit was $70 billion previous year - and for every vehicle America exports to Tokyo, Japan sends more than 100 to the U.S. The country also has a complex regulatory system that makes it tough to sell American autos in Japan.
Alongside the G7 countries, India also came for a tongue lashing and Trump even threatened to cut trade ties with countries who are "being unfair on trade".
Speaking during an impropmtu news conference at the G7 summit in Canada on Saturday, Trump said his ultimate goal was the elimination of all trade duties.
They appealed to Prime Minister Justin Trudeau to persuade his fellow G-7 leaders to commit 1.3-billion dollars U-S over three years to help send millions of girls to school.
At his news conference, Mr.Trump again called for Russian Federation to reinstated to the G7, a suggestion rejected by all the leaders, expect Italy's new populist Prime Minister Giuseppe Conte.
Mr Trump recently slapped tariffs on Canada, Mexico and the European Union, angering his counterparts before he arrived at the summit.
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.
Not one tweet, no.
Trudeau said five of the G7 countries agreed to a plastics charter to further protect the environment and oceans. I think it would be good for the United States.
He left the summit four hours earlier than originally planned, and will miss key talks on the environment, including working sessions on climate change, clean energy and the health of the oceans.
Trump withdrew the United States from the Paris climate accord and his attendance of a G7 session on the issue was in question well into the last minute.
A later statement, released by a member Mr Trudeau's communications team on Twitter, said there was nothing new in the Prime Minister's press conference.
On Canada, he is repeating his criticism of Canadian dairy but says he wants to make a deal on NAFTA, with two different types of sunset clauses - a stumbling block for Canada in the past.
Speaking in a solo press conference from the resort town of La Malbaie in Quebec, the president said that for too long, USA trade has suffered from "bad" trade deals agreed to by past US presidents.
"There are always other things we can work on", Trudeau said. "If you put an expiry date on a trade deal, that's not actually a trade deal".
But it was the tariffs issue that really set Trump off.
President Donald Trump suggested a radical change to the worldwide trading system in an apparent reversal of his recent tariff policy.