However, Merkel said it is too early to give up entirely on the United States and "There are still good reasons to continue our fight [aimed at keeping a close transatlantic partnership], even though we can not just rely on it anymore".
"I have made it very clear to the President that it is not something we relish doing, but it is something that we absolutely will do", Trudeau said.
"The withdrawal by tweet is, of course, sobering and a bit depressing", she said.
The European leader-famed for negotiating compromise without political histrionics-gave an uncharacteristically candid and combative assessment of relations with Trump as she spoke to German channel ARD, after last week's G-7 summit.
"There is no reason for us not to talk to each other, but this is going to be hard", Merkel said, adding that her dialogue with Trump will continue during the North Atlantic Treaty Organisation summit in Brussels in July.
Another image of the same gathering however suggests a more relaxed interaction, with Merkel smiling and Trump making eye contact.
President Trump has refused to budge on his tariffs against Canada and European countries.
We will act too, says the German Chancellor.
A photograph of world leaders from the Group of Seven nations with the most advanced economies surrounding Donald Trump, first shared on German Chancellor Angela Merkel's official Instagram account, went viral on social media over the weekend, inviting a flurry of jokes and multiple caption contests.
Trade was a massive issue at this year's summit with Canadian Prime Minister Justin Trudeau and President Trump butting heads.
Mr Trump had already threatened to divide the G7, made up of the US, France, UK, Italy, Germany, Japan and Canada, when he suggested Russian Federation should be allowed to rejoin the group.
Macron also tweeted Saturday a photo of the other leaders and aides surrounding Trump, who was one of just two people sitting.
Some media, though, interpreted the photo as another embarrassing moment for the U.S. Esquire sighed that the photo proved how Trump was still alienating our allies.
"As Canadians, we are polite, we're reasonable, but also we will not be pushed around", Trudeau said.
Echoing Merkel's sentiments, French President Emmanuel Macron's office said that "international cooperation can not depend on fits of anger and a few words", according to a statement published by French public broadcaster RFI. "We stand by it and whoever leaves it and turns their back on it is showing inconsistency and lack of character".
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