But Mattis, in an interview to air Sunday on a CBS talk show, said Trump was "wide open" on the Paris climate deal. His Treasury secretary, Steven Mnuchin, has said the United States reserves the right to be protectionist if trade arrangements are unfair to US companies and workers. "Changing the infrastructure of global trade to tilt it back toward the USA would save and create millions, easily", a White House official said, explaining the president's tweet.
Japanese Prime Minister Shinzo Abe said the G-7 also agreed to step up pressure on North Korea, including sanctions.
Axios is reporting that President Trump has "told multiple people, including EPA Administrator Scott Pruitt" that the US will pull out of the Paris climate change agreement, based on conversations with "three sources with direct knowledge".
The embrace of Middle Eastern autocrats and criticism of longtime European allies have drawn strong criticism from foreign policy leaders of both parties, to say nothing of the reception Trump received in the European media.
Perhaps more importantly we have reports of China being "strongly dissatisfied" with the mention of the East and South China Sea issues in a G7 statement which said they were concerned by the situation in the South China Sea and East China Sea.
He says: "There have been differences, to be sure, in some past summits, but not a sharp open split like this".
The first day of the summit on Friday failed to make progress on narrowing differences between the USA and its partners as Trump is still reviewing Washington's position.
Trump also has made a clear break from his Democratic predecessor, who during his final trip overseas called the U.S.
Earlier German Chancellor Angela Merkel criticised what she called "a very hard, not to say very unsatisfactory" discussion with Trump on the issue. The leaders found agreement on other points, such as backing closer cooperation against terrorism in the wake of the concert bombing in Manchester that killed 22 people. "We were all very clear about that and about the role of the Paris agreement".
The G-7 leaders had better luck finding agreement on the other problematic topic at the summit, trade.
Almost every nation that signed the 2015 agreement, including the six other G-7 members, has agreed to curb greenhouse gas emissions.
Trump, who has previously called global warming a hoax, tweeted that he would make a decision next week on whether to back the 2015 Paris Agreement on curbing carbon emissions following lengthy discussions with G7 partners.
Trump's pending review of USA climate policies has left environmentalists bracing for the possibility of bland G-7 promises that say little after years of increasingly stronger commitments to reduce reliance on fossil fuels and cut greenhouse gas emissions.
A person familiar with the talks said six members of the Group of Seven would stick with their endorsement of the Paris deal, and await a decision from the U.S. The person spoke on condition of anonymity to discuss the matter before the formal announcement.
In terms of trade, the leaders of the world's seven most economically advanced nations were to settle on whether to reconfirm their agreement to reject protectionist policies, which was set out in the 2016 summit in Ise-Shima, Japan, Efe news reported.