American allies are fuming over new tariffs on steel and aluminum imported into the USA, and over the president saying those tariffs will strengthen national security.
At the start of the Trump's presidency, many foreign leaders worked to develop cordial relationships with him, hoping that it would help to make Trump more willing to compromise on some of his more contentious campaign promises.
Mr Trump is expected to face stern opposition from the majority of the group over his protectionist policies on trade, including harsh new tariffs on steel and aluminium which would hit the European Union and Canada.
"Canada will not change its mind when it comes to the illegal and absolutely unjustified application of tariffs on steel and aluminum", Canadian Foreign Minister Chrystia Freeland said on Friday.
Trudeau has called the claim "insulting" and "laughable". The EU and Canada have both announced retaliatory tariffs.
Critics said the growing USA isolation is risky at a time when Trump is making diplomatic overtures with North Korea and in the Middle East and could use the support of allies. "And in the G-7, which used to be the the G-8 - they threw Russia out - they should let Russia come back in because we should have Russia at the negotiating table". "But we say that with great sadness", she said.
But before leaving Washington, he made clear that he too has no intention of backing down on his plan to rebalance trade by imposing tariffs on steel, aluminum and other goods imported from United States allies.
But US President Donald Trump is getting nasty and raising tensions before the meetings even begin.
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Conte, who is attending his first summit, had earlier indicated that he was in favour of Trump's proposal to welcome Russian Federation back into the organisation, which it was ejected from after annexing Crimea in 2014.
The two spoke with media on Friday ahead of a private meeting - and the topic of tariffs inevitably came up.
Trump's 17th century mercantilist trade policies are making the United States the skunk at the party at the G7 meet in Quebec on Friday.
The tone in the immediate run-up to the meetings at La Malbaie showed no sign of compromise between a U.S. president determined to disrupt the status quo to force more favourable terms for the USA, and six United States allies resolved to stop him.
Italian Prime Minister Giuseppe Conte attends during his first session at the Lower House of the Parliament in Rome, Italy, June 6, 2018.
But just hours before at the White House, Mr. Trump was not so friendly.
Tension has been building over a year of policymaking that has distanced the U.S. from traditional allies, including by Trump's decisions to withdraw the USA from the Paris climate accord and the Iran nuclear agreement.
They also renewed their commitment to the fight against climate change and to promote democratic values, free and open trade, and gender equality.
Russia was ousted from the elite group in 2014 as punishment for President Vladimir Putin's annexation of Crimea and support for pro-Russian separatists in Ukraine.