A group of leaders, which included Canadian Prime Minister Justin Trudeau, French President Emmanuel Macron and British Prime Minister Boris Johnson, were unwittingly filmed apparently discussing Trump at London's Buckingham Palace on Tuesday night, although the president's name was never mentioned.
Trudeau held a press conference shortly after Trump's response to the clip, and while he did mention the situation, he didn't offer an apology to the USA president. But the most risky moment of all - a press conference at which he was expected to face questions from the British media - did not happen after he announced he was going home early.
In this grab taken from video on Tuesday, Dec. 3, 2019, Canada's Prime Minister Justin Trudeau, centre, gestures as he speaks during a North Atlantic Treaty Organisation reception.
"Is that why you were late?"
Mr Trudeau, addressing Mr Johnson, the princess, Mark Rutte, the Dutch prime minister, and Mr Macron, said: "He was late because he takes a 40-minute press conference off the top". At one point, Trudeau says: "You just watched his team's jaws drop to the floor". The leaders did not appear to realise that they were being recorded.
In a news conference after the summit, Trudeau said his "jaw drop" comment had been referring to Trump's unexpected announcement that the next G7 summit will take place at Camp David and he had meant no offence. I know his character.
Merkel makes first official visit to Auschwitz
German chancellors have made the trip to Auschwitz before - Helmut Schmidt visited in 1977 and Helmut Kohl in 1989 and 1995. But none has visited since, and this first visit by a chancellor for 24 years is being viewed as highly symbolic.
Asked later about the video during a bilateral meeting with German Chancellor Angela Merkel, Trump said of Trudeau, "He's two-faced".
"As you all know, we have a very good and constructive relationship between me and the president", Trudeau told reporters at a news conference. At least back in the USA, comedians and just about anyone else are more than happy to make fun of the president to his face. His complaint has been that some of NATO's 29 members are not spending two per cent of their Gross Domestic Product (GDP) on defence, as agreed in 2014 as an indirect response to Russian aggression in Crimea.
Countries other than America have agreed $160bn (€144bn) in additional spending since 2016. He pointed to the White House Correspondents dinner where Barack Obama mocked him, arguably the impetus for Trump's run for president. This has made him, I think, not only a pariah in the civilized world, he's nearly an outcast especially among America's allies.
The 70th anniversary summit, held his week in Watford, England, began and ended in acrimony startling even for the era of Trump.
Asked about Huawei, Johnson said it was important to balance foreign investment and security, adding that Britain would not take a decision out of step with its intelligence allies. He replied: "That's absolute nonsense". I don't know where that has come from'.