Trump, who has imposed 25% tariffs on almost all products imported from Canada, has repeatedly said this year that the US has a “$200 billion” trade deficit with Canada – sometimes making the claim explicitly and sometimes using vaguer language about a supposed $200 billion subsidy or loss to Canada.

Finance ministers and central bankers from the G20 top economies gather in South Africa on Wednesday and Thursday, for a meeting marred by the absence or curtailed attendance of key members and disputes over the main issues of climate, debt and inequality.

President Donald Trump has postponed 25% tariffs on many imports from Mexico and some imports from Canada for a month amid widespread fears of the economic fallout from a broader trade war.