World leaders at the NATO summit in London were caught on camera appearing to joke about US President Donald Trump during a reception at Buckingham Palace Tuesday evening.

The video appears to show British Prime Minister Boris Johnson, French President Emmanuel Macron, Canadian Prime Minister Justin Trudeau and Dutch Prime Minister Mark Rutte having a laugh about Trump’s behavior during the summit.
 
The 25-second clip, which has gone viral and was first reported by CBC, begins with Johnson asking Macron why he was late.