Canadian Prime Minister Mark Carney said emphatically Tuesday that Canada is "not for sale" and "won't be for sale, ever" in an Oval Office meeting with President Trump, moments after Mr. Trump called the border between the U.S. and Canada "artificial" and romanticized the idea of Canada joining the U.S.

A series of ornate golden appliqués that were affixed to the fireplace have started to appear elsewhere in the room, as if the decor were multiplying itself.