Even as Canada’s prime minister announced more than $100 billion in retaliatory tariffs, he made clear that he was imposing them reluctantly.

Trump says he will levy a 25% import tax on all steel and aluminium products entering the US from 12 March, meaning both sides have a month to negotiate. Canada is the top exporter of both metals to the US.

Canadian Prime Minister Justin Trudeau said on Tuesday that Canada would seek to highlight the negative impact of the United States' steel and aluminium tariffs and that - if needed - the response from Canada would be firm and clear.