The audience came amid Canada’s trade war with America, with President Donald Trump also repeatedly proposing to make the nation the US’s 51st state.
Mr Carney told Charles they had “much to catch up on” in their first meeting together as a prime minister and King.
He later posted on X: “My thanks to His Majesty King Charles III for his warm welcome and gracious hospitality today.
“Canada is fortunate to have a steadfast defender in our sovereign.”
Charles met Mr Carney, former governor of the Bank of England, in the 1844 Room of the royal residence in London, ahead of the Canadian leader’s visit to Downing Street to see Prime Minister Sir Keir Starmer.
The King, who was wearing a red tie, perhaps a nod to the Canadian flag, …