Canada is considering imposing retaliatory tariffs on the US if Donald Trump places a 25 per cent import tax on its exports.

The president-elect said that he would impose the across-the-board tariffs on Day 1 and that they would stay in place until Canada, Mexico and China halted the flow of drugs and migrants.

President-elect Trump's plan to increase tariffs on goods from China and impose them on products from Mexico and Canada would drive inflation up by nearly 1%, Goldman Sachs estimates.