U.S. President Donald Trump on Monday said he was thinking of imposing 25% tariffs on imports from Canada and Mexico because they were allowing many people to cross the border as well as fentanyl.

Trump, who was sworn in as president just after noon on Monday, has been reviewing three options: a 25 per cent tariff on Canadian goods, a 10 per cent tariff on goods from all countries or an escalating tariff that starts low and rises over time, according to Canadian officials.