US President Donald Trump has said he will follow through with his threat to hit imports from Canada and Mexico with 25% border taxes, known as tariffs, on 1 February. But he added that a decision about whether this would include oil from those countries has not yet been made.

President Donald Trump reportedly elicited gasps from the international crowd gathered at the World Economic Forum in Davos, Switzerland, on Thursday when he suggested that Canada could become a U.S. state in order to avoid the sweeping tariffs he wants to impose.