US President Donald Trump has accused the Canadian Prime Minister Justin Trudeau of being "two-faced".
His remarks come after a video emerged of several world leaders apparently casually discussing Mr Trump.
It shows a snippet of a conversation involving Mr Trudeau, British Prime Minister Boris Johnson, French President Emmanuel Macron, Dutch Prime Minister Mark Rutteand others at Buckingham Palace in London.
Mr Trudeau - who had met with Mr Trump earlier on Tuesday - is heard saying: "He was late because he takes a 40 minute minute press conference off the top."
The US president had made lengthy remarks to the media ahead of his meeting with Mr Trudeau earlier in the day.
Elsewhere, Mr Trudeau said: "You just watched his team's jaws drop to the floor". It was not immediately clear what he was referring to.
Other comments in the video are inaudible, although Mr Macron is seen responding animatedly to Mr Trudeau's comments.
This is quite the video from the CBC showing Trudeau, Macron, and Johnson discussing what appears to be Trump. pic.twitter.com/QDgIXwEwlk
— Kyle Griffin (@kylegriffin1) December 4, 2019
Addressing reporters as he met with German Chancellor Angela Merkel this afternoon, the US president accused Trudeau and his administration of not spending money enough on defence and NATO - echoing comments he made yesterday while sitting alongside the Canadian leader.
Questioned today about Mr Trudeau, Mr Trump said: "Well he's two-faced.
"I find him to be a very nice guy... but the truth is that I called him out on the fact that he isn't paying 2%, and I guess he's not very happy about it.
"That's the way it is. I'm representing the US, and he should be paying more than he's paying, and he understands that.
"I can understand he's not that happy, but that's the way it is."
Shortly after his comments, Mr Trump confirmed in a tweet he would not be holding another press conference in the UK following today's meetings in Watford.
He said: "I will be heading back to Washington. We won’t be doing a press conference at the close of NATO because we did so many over the past two days. Safe travels to all!"