Trump says that Canada must pay $61 billion to be part of his proposed 'Golden Dome' program, adding though that the cost would drop to zero if Canada became part of the US.

Prime Minister Mark Carney said Canada "won't be for sale, ever" in an Oval Office meeting with President Trump.

Whether PM Mark Carney can truly shield Canada from the economic and geopolitical salvos of Donald Trump remains to be seen, but how he rises to that challenge will determine the trajectory of US-Canada relations for years to come.

Trump has announced 25% tariffs on car imports into the United States.