Trump made the comment at the White House Friday after hours of further escalating his rhetoric against longtime allies over US trade practices. "They should let Russian Federation come back in because we should have Russian Federation at the negotiating table", the U.S. leader said before boarding the presidential jet.
Russian Federation was suspended from group in 2014 because of its annexation of Crimea from Ukraine.
While he's taken a tougher stance on traditional US allies, Trump - who remains under investigation as part of an inquiry into potential collusion between his presidential campaign and the Kremlin - has charted a warmer course with Russian President Vladimir Putin.
The President of the European Council dismissed Mr Trump's leadership a "seasonal turbulence" and predicted the G7 group would prevail despite America's isolationist policies.
World leaders are hoping to convince Trump to back off recently-implemented tariffs on steel and aluminum, which were levied on USA allies including Canada, Mexico, and the European Union last week despite months of negotiations between parties over exemptions for the measures.
Apart from this nascent trade war, Trump has also pulled the USA out of the Iran nuclear deal, threatening foreign companies that still want to do business there.
The comments come one day after Trump called Trudeau "indignant" on Twitter Thursday night, and referenced a tariff of up to "300% on dairy" saying he was hurting USA farmers.
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"There are disagreements. He's sticking to his guns, and he's going to talk to them", said Larry Kudlow, Trump's top economic adviser, at a briefing on Wednesday. "It will start first of all to hurt USA workers".
Trudeau says he hopes to work through any conflicts.
Donald Trump, feeling short of allies among his country's closest friends, called for Vladimir Putin to be let back into the G7 club.
"I agree with the Presiden @realDonaldTrump: Russia should go back into the G-8".
After an angry tirade on Twitter on Thursday night, in which he lashed out at Trudeau, the summit host, and French President Emmanuel Macron, Trump used the afternoon session to run through his litany of complaints, citing specific trade deficits between the US and allies in certain sectors. The European Union also attends. "Look forward to seeing them tomorrow".
When Trudeau complained to Trump about the new tariffs he slapped on Canadian goods, saying he was especially upset that the pretext Trump used was that Canada formed a "national security threat" to the US, Trump replied, "didn't you guys burn down the White House?" Why are we having a meeting without them?
Trump was the last G7 leader to arrive Friday and on Saturday, he will probably be the first to leave, in a hurry to move on to his nuclear summit with North Korea's Kim Jong Un in Singapore. Trump's "America first" agenda triggered widespread criticism at the G20 summit a year ago. The EU is also attending the summit.
World leaders gather for G7 summit, amid Trump-fueled trade tensions
President Donald Trump is renewing his threat to quit Nafta, after his economic adviser earlier this week said he wouldn't. Trudeau and his fellow G7 leaders will try to persuade Trump to reverse the duties when they meet him during the summit.
On the eve of the summit meeting, a 2000 editorial resurfaced from a small British Columbia newspaper admonishing Mr. Trudeau for what it said was "inappropriately "handling" of a female reporter, creating one more fire Mr. Trudeau had to douse.
Under Trump, the United States has abandoned its traditional role in the G-7. They also reaffirmed their commitment to the world's rules-based order - something Trump has little time for.
Trump's escalation of tensions with allies was "beyond shortsighted", said Heather Conley, a former U.S. State Department official in the George W. Bush administration. France's finance minister described the group as "far more a G-6 plus one than a G-7".
Earlier on Twitter, Macron said six of the seven G7 countries "do not mind" signing an agreement if need be - essentially isolating the United States. And they met again late this afternoon. "It it doesn't happen, we come out even better", he tweeted on Friday morning.
Earlier this year, President Trump announced that the USA would withdraw from the Iran nuclear agreement, which has sparked backlash among allies. The new tariffs - 25 percent on imported steel, 10 percent on aluminum from Canada, Mexico and the European Union - threaten to drive up prices for American consumers and companies and heighten uncertainty for businesses and investors around the globe.
There is no doubt, though, that Trudeau is upset that the US would invoke security concerns as justification for the tariffs.
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