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.

Canada has pledged to spend $1bn on border security, and has recently deployed newly leased Black Hawk patrol helicopters, extra dogs and 60 drones at the border partly in response to Trump’s demands — as well as concerns about weapons and undocumented migrants arriving from the US.