Trump agreed with the language in the communique from the summit in Canada Friday and Saturday, but took offense at criticism of USA tariffs by Canadian Prime Minister Justin Trudeau at his news conference after Trump left early.
In a flurry of tweets from Air Force One, en route to Singapore for a historic nuclear summit with North Korea's Kim Jong Un, Trump accused the summit host, Canadian Prime Minister Justin Trudeau of being "very dishonest".
Asked if she was concerned that Trump could retaliate against European Union counter-measures by imposing tariffs on cars, Merkel said: "First of all, we'll try and see if we can prevent this".
Asked about Trump's threat to target USA tariffs against cars - a vital industry for Germany which supports over 800,000 jobs - "we will have to think again about what we'll do", Merkel said.
Trump has pointed to Canadian Prime Minister Justin Trudeau's criticism of him as a reason for withdrawing from the consensus statement.
"Russia is focused on other formats, apart from the G7", Kremlin spokesman Dmitry Peskov said in a brief statement reported by the government-controlled Sputnik news agency.
He wrote on his Twitter profile: "Please tell Prime Minister Trudeau and President Macron that they are charging the U.S. massive tariffs and create non-monetary barriers".
The U.S. president arrived several minutes after the start of the breakfast meeting between G7 leaders and the gender equality advisory council that Prime Minister Justin Trudeau created for this year's summit in the Charlevoix region of Quebec. "I've been called worse things by better people", said the elder Trudeau.
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The insult came in one of two blistering attacks by Trump's top aides for what they saw as Trudeau's betrayal of the president at the end of the weekend's G7 summit.
Alluding to the tensions as he sat with Macron on Friday, Trump said: "We've had, really, a very good relationship, very special". By its second day, the summit had dissolved into chaos, with Trump leaving early and then retracting his endorsement of the final statement from the G7.
He was reacting to Trudeau's declaration that Canadians would "not be pushed around" and would hit back at punishing United States tariffs on metal imports with "equivalent tariffs".
He insisted, like Trump himself has done many times, that Canada has enormous tariffs itself - especially on certain dairy and food products.
Trump was reacting to comments made by Trudeau at a press conference on Saturday in which he threatened to torpedo negotiations on a new NAFTA deal if the Americans did not remove tariffs on Canadian steel and aluminum.
A senior British government source said that Russian Federation needs to change its approach before any conversation about it rejoining the G7 can begin.
"If they retaliate, they're making a mistake", Trump said.