MONTREAL — Could Canada’s relations with the United States have taken a turn for the worse after its leading public broadcaster cut a seconds-long scene of President Trump from “Home Alone 2: Lost in New York?”

Canadians were momentarily pondering that unlikely question over the Christmas holidays after the CBC broadcast the 1992 film without a cameo by Mr. Trump. In the scene, the character Kevin McCallister, played by Macaulay Culkin, asks Mr. Trump how to get to the lobby of New York’s ornate Plaza Hotel (which Mr. Trump owned at the time).

The CBC said the cut had been made for time’s sake, and before Mr. Trump’s political career, but as the omission drew media attention, Mr. Trump’s son Donald Trump Jr. posted about it on Thursday on his Instagram account, calling the alteration “absolutely pathetic” and saying it proved that the news media “really are the enemy of the people.”

That evening, President Trump himself weighed in, retweeting an article about the edited version and adding an allusion to Prime Minister Justin Trudeau of Canada: “I guess Justin T doesn’t much like my making him pay up on NATO or Trade!”