Speaking at the summit on Saturday, Trump called for Russian Federation to be brought back into the G7, dismissing the annexation of Crimea as "something that happened a while ago" which shouldn't stand in the way of peace.
The PM also said she had spoken to Mr Trump "briefly" at the summit about his upcoming visit to the UK. Previous G7 summits have seen large-scale anti-globalization protests, but Trump was a main target of the demonstration as masked anarchists set fire to United States flags and those of other G7 nations. "We'll see how it all works out, but we've made a lot of progress", Trump said, sitting by Trudeau after talks that an official said were marked by "strong disagreement" but "not heated".
Despite earlier reports of a rant over trade from Trump, he said the meeting "was not contentious" and called the relationships between the leaders "outstanding". "Whether you like it or not, and it may not be politically correct, but we have a world to run".
Mr Trump is leaving early to head to Singapore for his landmark summit with North Korean leader Kim Jong-un, meaning he will miss some of the topics advanced by Mr Trudeau.
He said: "Russia should be in this meeting".
A key question was whether the seven countries could agree on a joint statement of priorities at the conclusion of the meeting.
"If you have a strategy, do not explain your strategy before the meeting - because if you are explaining your strategy before the meeting, you are losing your strategy", European Commission President Jean-Claude Juncker told reporters.
"The U.S. has been taken advantage of for decades and decades, and we can't do that anymore", Trump said.
Trump's press conference Saturday marked his first solo press conference since February 16, 2017.
When a CNN reporter asked Trump about anger and frustration from United States allies over trade, he lambasted the reporter and his "fake friends at CNN".
European officials at the summit were shocked by the idea, or dismissive, and Tusk, while admitting that it was hard to be surprised by Trump's pronouncements any more, said: "Let's leave the G7 as it is". Canada, Mexico and the European Union all threatened retaliatory tariffs after their exemption status was lifted.
A Kremlin spokesperson meanwhile said they were interested in "other formats", apart from the G7.
On Saturday, while diplomats wrangled in private, summit host Prime Minister Justin Trudeau gathered the other leaders for a breakfast session on women's equality.
President Donald Trump on Saturday doubled down on his call for Russian Federation to be readmitted into the G7 and blamed his predecessor for Russia's aggression in Crimea.
Macron said he and Trump held "open and direct" discussions, adding that he thought there was a way to get a "win-win" outcome on trade, though details remained unclear.
At issue are new US tariffs on steel and aluminum imports.