Trump, who attended the day one of the summit pitched the idea of discarding all tariffs and trade barriers between the United States and its G-7 allies.
Canada's Justin Trudeau and other leaders had given closing press conferences and announced a US-backed joint statement.
Asked whether she could imagine the idea of a complete abolition of tariffs proposed at some point with Trump, Merkel said that in an ideal case this could be achieved, but cautioned that the issue of subsidies should also be taken into account. Japanese Prime Minister Shinzo Abe stands next to Trump, also with folded arms, as French President Emmanuel Macron leans in next to Merkel.
Trudeau later said he reiterated to Trump that tariffs will harm industries and workers on both sides of the U.S.
Other G7 countries lobbied unsuccessfully at the summit for the USA oto reverse its tariffs on imported steel and aluminium imports.More news: E3 2018: The Elder Scrolls: Legends Coming to Consoles Later This Year
"This looks like an episode of Celebrity Apprentice where Trump is about to fire Angela Merkel because her strudel marketing plan fell through", Washington-based comedian Tim Young tweeted.
"Europe must take its fate into his own hands and no longer imprudently follow the US", Merkel said.
Earlier today, Mr Trump took to Twitter to launch an angry attack against his key allies saying the United States "paid close to the entire cost of NATO" to help countries that "rip us off on trade".More news: Rafael Nadal beats Dominic Thiem for 11th French Open title
Merkel was not the only one to criticize Trump's move.
The low expectations could allow the leaders to cast any consensus as an achievement, especially given that Trump and most of the other G-7 leaders headed into the meeting appearing ready to fight. In his turn, Trump announced that the USA would be looking to impose tariffs on auto imports.
In comments to reporters from her home country, Merkel offered what may be her strongest direct criticism of Trump so far as the relationship between the two leaders continues to fray. Trump called him "very dishonest and weak" in a tweet after Trudeau repeated criticisms of us tariffs on imported steel and aluminum and Trump's trade policies in a news conference following the Group of Seven meeting in Quebec.More news: G7: Trump leaves summit prematurely for meeting with Kim Jong
"We're going to deal with the unfair trade practices".