Later on Saturday, after Canadian Prime Minister Justin Trudeau said all seven nations had signed a joint communique at the end of the summit, Trump angrily lashed out on Twitter, stating the USA would not endorse the statement.
President Trump concluded his visit to the Group of Seven summit on Saturdaywith warnings to US allies, saying if they don't eliminate barriers to trade, they could lose access to the USA economy.
He fired off furious tweets saying he told USA representatives "not to endorse the Communique" and accusing Canadian Prime Minister Justin Trudeau - who hosted the summit - of being 'dishonest and weak'.
"On the issue of trade, we have been able to agree on important questions to us", she added, stressing that it was "important to have a commitment to rules-based trade".
Asked why she allowed Trump to run rings around her, Merkel pointed to the EU's retaliatory tariffs and said, "We don't let ourselves be taken advantage of again and again".
"The Prime Minister said nothing he hasn't said before - both in public, and in private conversations with the President".
The French president's office said in a statement: "International co-operation can not be dictated by fits of anger and throwaway remarks".
He said Trump agreed with the fairly generic trade language in the communique drafted by the G7 leaders, who are traditionally America's closet allies.
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The joint statement between the leaders of G7 nations comes after President Trump refused to back down from his decision to impose worldwide tariffs on goods, including steel and aluminum imports.
Trump and Kim are expected to meet in Singapore on Tuesday with talks focusing on the denuclearization of the Korean Peninsula. I think it would be good for the world.
"We urge Russian Federation to cease its destabilising behaviour, to undermine democratic systems and its support of the Syrian regime", the leaders said in a statement at the end of their two-day meeting in La Malbaie, Quebec.
"The step he took after the meeting, withdrawing his acceptance of the communique, is an affront", said Juergen Hardt, a lawmaker and spokesman for foreign policy within Merkel's CDU/CSU caucus.
"As Canadians, we are polite, we're reasonable, but also we will not be pushed around", Trudeau said.
Mr Trump on Saturday threw the G-7's efforts to show a united front into disarray after he became angry with Mr Trudeau, and said he might double down on import tariffs by hitting the sensitive auto industry.
In response, the European Union is preparing new tariffs set to hit U.S. exports ranging from jeans to bourbon whiskey. "Instead, we act then too", Merkel said in an unusually combative tone. In late May, Washington slapped its allies with import tariffs on steel and aluminum after it failed to win concessions from its trading partners.
The US president argued that the invasion and annexation happened a long time ago and that a G8 (G7 plus Russia) makes more sense than the G7.