In sharp exchanges underlining discord in a transatlantic bloc hailed by many as the most successful military pact in history, Trump demanded that Europe pay more for its collective defense and make concessions to USA interests on trade.
Judging by the clip, it looks like the Donald is not very liked in that circle but he also did not hesitate to clap back, as always.
At a Buckingham Palace reception that night, Trudeau was caught on camera with Macron, Britain's Boris Johnson and Mark Rutte of the Netherlands laughing at Trump. "I've found him to be a very nice guy".
At another point in the video, Trudeau is heard saying about the Trump meeting, "His team's jaws drop to the floor". Trump and Trudeau had met yesterday.
There was a receiving line for the first couple at the Buckingham Palace and Queen Elizabeth II seemed to gesture to Anne to also join the line like the other royal family members but she ignored the suggestion and simply turned away. Using that footage, combined with previous embarrassing moments (including the time he got laughed at during a United Nations speech), Biden's team released a new and devastating ad calling Trump "incapable of world leadership".
This trouble between Trump and Trudeau comes as Ontario Premier Doug Ford is in Washington to discuss trade issues with business and political leaders.
At a press conference he said: 'As you all know, we have a very good and constructive relationship between me and the President'.
Nato's 29 members have a target of spending 2 per cent of their GDP on defence, and Canada is among the majority in failing to do so. And after the session wrapped up, he said of Mr Trudeau: 'He's two-faced.
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While NATO leaders emphasised unity, Trump convened his own sub-group of the alliance - limited to only those meeting the defence spending target.
Trudeau needs Trump to lean on China to get Michael Kovrig and Michael Spavor released.
The Democratic presidential frontrunner's ad makes for a blistering critique of the president's ability to lead on the global stage.
I received a fundraising email from former Vice President Joe Biden which captured the profound difference in the approach to foreign policy between Democrats and President Trump.
Deputy Prime Minister Chrystia Freeland, speaking on CTV on Thursday, was hesitant to say that relations had been damaged at the summit. The vice president's son, Hunter Biden, sat on the board of a Ukrainian energy company.
"The world is laughing", read the text over that clip and others of Trump's trips overseas.
"I really don't know", he said, and encouraged reporters to ask Giuliani about the calls, but claimed they are "no big deal".