"Something's going to happen. After a long day of work and very direct dialogue, we are actively seeking an ambitious agreement", an English translation of Macron's tweet reads.
Canada has been particularly outraged that Trump invoked a national security justification for his global tariff on steel and aluminium imports, even those from close United States allies.
The president has been at odds with key allies over the new tariffs, which dominated his talks with the leaders of major industrialized nations in the Canadian resort town.
"Why are we having a meeting without Russian Federation being in the meeting?"
The summit is being held at a luxury resort more than two hours' drive from the provincial capital, where more than 400 protesters faced off Thursday and Friday against police. "It's highly unlikely there will be a final communique", a G7 official said on condition of anonymity.
The G-7 groups Britain, Canada, France, Germany, Italy, Japan and the United States, plus the European Union.
Trump has long argued that the U.S. is trapped in a number of trade deals that put the country at a competitive disadvantage.
Anticipating a tense two days in Quebec, Trump has complained about having to attend the summit, particularly since it comes just before his high-stakes meeting in Singapore with North Korean leader Kim Jong Un, said two people with knowledge of his thinking.
Sharp disagreements on trade are making it hard for nations to come up with the traditional concluding statement from the agreement.
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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".
American National Security Advisor John Bolton, however, offered a different interpretation of the photograph.
Trump's announcement on Twitter, after leaving the Group of Seven summit in Canada early, that he was backing out of the joint communique torpedoed what appeared to be a fragile consensus on a trade dispute between Washington and its top allies. The White House is expecting a chilly reception from Canada and West European countries, already frustrated over Trump's withdrawal from the Paris climate accord and the Iran nuclear agreement.
A spokesman for Canada's Trudeau said that Ottawa's position against such a move had not changed.
The spat has financial markets anxious about tit-for-tit escalation.
Kudlow said the traditional post-World War II free trade policies have "been broken in the last 20 years-plus" and said the World Trade Organization is "completely ineffectual". Canada and Mexico, the other members of the 1994 pact, have been frustrated by the slow pace of talks to renegotiate NAFTA.
Instead, the host, Canadian prime minister Justin Trudeau, could issue a less-formal chair's statement.
The summit did not mark the end of the transatlantic partnership between Europe and the U.S., Merkel said.