Although Trump and Kudlow have since claimed Trudeau "stabbed us in the back" and was the reason for the U-turn, it is Trump's actions that other G7 leaders appeared to find frustrating.
Some Twitter users did not agree with Bolton's opinion, criticizing Trump's policies and the way his administration deals with USA allies.
The response from Mr Macron suggests an end to what observers had noted was a budding "bromance" between the French president and Mr Trump.
The picture, snapped Saturday by German government photographer Jesco Denzel, shows a standing Merkel with her hands firmly planted on a table staring down at Trump, who is seated with his arms folded and eyes glaring. "No more. (photo by @RegSprecher)", crediting Merkel's spokesman Steffen Seibert's account for the image for good measure.
She said the European Union would "act" against the US trade measures, which European leaders regard as going against the rules of the World Trade Organization.
The centre-right leader said a tariff-free area among G7 allies would be an ideal outcome, but she made clear that any talks about such a trade bloc would have to include non-tariff barriers to trade as well as free access to public tenders.
Trudeau later said he reiterated to Trump that tariffs will harm industries and workers on both sides of the U.S.
The picture (and many memes) have since gone viral on the internet, and Trump raised it himself at the news conference after he was asked about his relationship with Canadian Prime Minister Justin Trudeau. She further said that the USA tariffs were "illegal and unjustified" and Canada did not believe in using "ad hominem attacks".
That statement had sought to overcome deep disagreements, notably over trade. "We agree that a return by Russian Federation to the G-7 format can not happen as long as there isn't any substantial progress in regard to the problems with Ukraine", said Merkel, CNN reported.