The summit of the Group of 7 nations got underway on Friday in Canada with global trade and North Korea the main topics of discussion.
Spokesperson Nicole Filion said observers have noticed some police carrying assault rifles, which she said could scare people out of exercising their right to protest.
The confrontation over US tariffs on steel and aluminum imports threatened to rupture the G7, which during its 42-year history has traditionally sought to find consensus on the economy and other issues. "And they understand it's going to happen", Trump said before departing for the summit in La Malbaie, Quebec.
Ahead of the summit, the two presidents had engaged in a Twitter spat, in which the French president suggested that a G6 agreement could be signed without the USA, while Trump accused Macron and Canadian Prime Minister Justin Trudeau of "charging the U.S. massive tariffs".
Government sources said Abe reiterated Japan's hopes of achieving economic growth under the Trans-Pacific Partnership free trade pact and Economic Partnership Agreement with the European Union.
"We aren't talking enough about Africa", said Martin, who as Canadian finance minister proposed the idea of a G20 in 1999 with the support of then U.S. Treasury Secretary Larry Summers. The European Union also attends the summit as do other dignitaries from around the world.
Quebec City's historic district looked as though business owners were preparing for a mini hurricane to blow through the cobblestone streets on Thursday, as several storefronts were barricaded with plywood in anticipation of anti-G7 protests.
"In a country like Canada, I find it extremely important that people are able to express their agreement or disagreement with politics, individuals, their concerns", Trudeau said. Among his shots is criticism of Canada for unfairly charging tariffs on dairy products shipped to the US.
French President Emmanuel Macron warned Trump in a rare rebuke on Thursday that the other six members of the G7 might form their own group, adding that no leader "is forever".
Martin, who participated in both G7 finance ministers' meetings and leaders' summits as prime minister when the forum was configured as the G8 to include Russian Federation, told Xinhua that Canada's harsh response to the U.S.tariffs was "warranted" and noted that "never in my time have I seen an issue which has so galvanized people" at those gatherings.
While the G7 leaders have largely praised Trump for his efforts to stabilise the Korean peninsula, they are unhappy he pulled out of an agreement created to limit Iran's nuclear ambitions.
In Germany, top officials called for Europe to remain unified in the face of rising trade tensions with the United States even as they maintained that America remained its closest partner outside the continent.