Donald Trump says Russian Federation should be be allowed to rejoin G7

As Trump prepared to join the annual G-7 leaders' summit on Friday, which is taking place in Canada, he said he would favor allowing Russian Federation to rejoin the group.

Patrick Doyle/The Canadian Press Prime Minister Justin Trudeau and French President Emmanuel Macron walk down the Hall of Honour on Parliament Hill in Ottawa on June 7, 2018.

The six other countries of the G7 represent a larger market than the American market.

The G7 Summit has been largely overshadowed by Trump's attempts to organize a summit with North Korea in the coming days.

British Prime Minister Theresa May took a more measured tone, telling reporters she wanted the European Union to use restraint in its retaliation to the USA tariffs and that the response must be proportionate and legal.

European Council President Donald Tusk, who will attend the meeting of EU leaders, said in the New York Times this week "Europe must now do everything in its power to protect the trans-Atlantic bond, in spite of today's mood".

The White House has downplayed reports of tensions between the leaders, but stressed that the president is committed to overhauling trade practices. "The President of the United States thinks that the US has been treated in an unfair way by Europe and by others, and the others think that this is not the case", European Commission President Jean-Claude Juncker told a press conference in La Malbaie.

"Prime Minister Trudeau is being so indignant, bringing up the relationship that the USA and Canada had over the many years and all sorts of other things", Trump said in a tweet on Thursday.

Host Canada and its European allies are striving to put together a united front to oppose Trump's opposition of tariffs of aluminum, steel, cars and other exports, but the markets are rattled. Trump said at the White House just before departing.

Trump's imposition of steel and aluminum tariffs on his G7 partners, as well as broader disagreements on trade and climate change, are setting the stage for some tense face-to-face meetings here Friday after Trump's arrival at the Quebec summit.

Trump also said Trudeau was being "indignant" about the cross-border trade relationship.

"If I can get the president to actually realize that what he's doing is counterproductive for his own goals as well, perhaps we can move forward in a smarter way", Trudeau said.

Leaders were also expected to use the event to raise contentious issues like US participation in the Iran nuclear deal, known formally as the Joint Comprehensive Plan of Action, and USA participation in global climate treaties. Canada has countered with a plan to impose tariffs of its own on USA metals and other consumer goods.

In response, the Canadian official replied that "the prime minister and the president have very frank, direct, candid, honest conversations".

The Trump administration has also been engaged in contentious talks with Canada and Mexico to renegotiate the North American Free Trade Agreement (NAFTA).

But they also made it clear that won't keep them from pushing Trump to end the tariffs, which they brand as illegal and bad for everyone's economy.