Donald Trump has deliberately picked a fight with its northern neighbour. This malign strategy must be stopped

It is two months since Justin Trudeau announced his resignation as Liberal party leader and Canada’s prime minister. After a decade in power, Mr Trudeau had become increasingly unpopular. Two out of three Canadians thought he was doing a bad job. The opposition Conservatives led in almost every poll. With the Liberals staring a 2025 general election defeat in the face, Mr Trudeau’s ministers forced him out. His successor will be chosen this Sunday.

But then came Donald Trump. Mr Trump wants to strengthen the US at the expense of its neighbours. His hostility to Canada is thus visceral and deep. Without any justification, he promised illegal 25% tariffs on all Canadian and Mexican imports. As a fig leaf for his intentions, he falsely claimed that Canada’s 5,000-mile border with the US was an open door for migrants and drugs. He talked, repeatedly and deliberately, of annexing Canada and making it the 51st state. He mocked Mr Trudeau, referring to him as merely a state governor.