Moments before he arrived at the White House, President Trump posted a scathing attack on the neighbours.
"Why is America subsidising Canada by $200 billion dollars a year, in addition to giving them FREE military protection, and many other things?" he posted on his Truth Social platform.
"We don't need their cars, we don’t need their energy, we don't need their lumber, we don't need ANYTHING they have… They, on the other hand, need EVERTHING from us!" he added.
But when Mark Carney arrived at the West Wing, it was all smiles and handshakes.
Donald Trump welcomed him to the Oval Office, boasting it had been refurbished "with love and carat gold".
Having commended Mark Carney on his election victory, the electorate became the focus of a brief debate on annexation.
When Trump described it as "better" for people in Canada, Carney replied that he'd "met with the owners of Canada over the course of the campaign… and it's not for sale".
Asked if that made discussions more difficult, the president replied: "…Never say never."