"Canadians, we're polite, we're reasonable, but we also will not be pushed around".
The Prime Minister said the United Kingdom still wanted to discuss a post-Brexit trade deal with the USA and said Mr Trump was still looking forward to July's visit to Britain. Canadian Prime Minister Justin Trudeau has sat patiently through several rounds of talks to renegotiate NAFTA, only to see Trump repeatedly threaten to tear up the agreement if Ottawa doesn't agree to what it sees as unreasonable demands.
Earlier in the day, Trudeau had sniped about Trump's late appearance at a women's empowerment breakfast, referring to "stragglers". Mr Trump said the move would protect domestic producers that were vital to U.S. security.
He said: "International co-operation can not depend on being angry and on sound bites. Let's be serious", the official, speaking on condition of anonymity, told Reuters.
As well as criticising the tariffs, Mrs May also opposed Mr Trump's call for Russian Federation to be readmitted to the group of leading industrialised nations, because he claimed it would be an "asset" to have Vladimir Putin back at the summit table. Bannon said China is "now on notice that Trump will not back down from even allies" complaints in his goal of "America First'".
Trudeau said the G7 had agreed to an "ambitious" communique, but he acknowledged the leaders left La Malbaie without significantly transforming Trump's increasingly confrontational approach to trade. Trump has also maintained his stance that tariffs are a national security issue, because unfair trade deals "affect our military", he said.
"We are like the piggy bank that everyone is robbing and that ends", he told a news conference before flying to Singapore for denuclearzation talks with North Korean leader Kim Jong-un.
At his news conference, Mr.Trump again called for Russian Federation to reinstated to the G7, a suggestion rejected by all the leaders, expect Italy's new populist Prime Minister Giuseppe Conte.
Trade experts who have watched Trump negotiate with tough words on Twitter before said the bark of Trump's tweets often exceeds the bite of his policy - but that this time, Canada might struggle to respond.
"It allowed a dialogue, where for weeks there were uncoordinated unilateral actions and non-cooperation".
President Trump said retaliation tariffs from his allies were a "mistake" and warned that if it got as far as a trade war, then the U.S. would "win that war a thousand times out of a thousand".
The prospect that he could be moving toward an even greater protectionist trade policy is likely to chill financial markets anxious about tit-for-tit escalation that could lead to a full-blown global trade war.
The EU then announced tariffs on United States goods ranging from Harley-Davidson motorcycles to bourbon.
His comments follow his administration slapping Canada with hefty fines, as Ottawa looks to implement its own levies on American products starting Jul. 1.
At issue, Trudeau defending his country's retaliatory tariffs on the U.S. Now he has become one of the loudest critics of the new steel and aluminum tariffs, calling them "insulting and unacceptable", and has vowed to respond with penalties on more than $12 billion in US goods.
The thorny issue of Mr Trump's planned tariffs on steel and aluminium imported into the U.S. has upset the consensus among industrialised nations on a transition to freer trade.
"It's economic. It's the balance sheet".
However, Maas also warned that Europe should not adopt an adversarial attitude towards the United States as a whole.
Mr Trump made the comments after the communique had already been officially released in response to a press conference held by Justin Trudeau to mark the close of the summit.