Mark Carney, a central banker turned politician, steps into his role at a crucial moment as President Trump sets his sights on Canada’s sovereignty and keeps threatening more tariffs.

Mark Carney has been sworn in as Canada's new prime minister as the nation faces Trump's trade war. 'We're his largest client in so many industries,' Carney says.

Carney has promised to stand up for Canada amid brewing trade war with Trump and speed up sluggish growth in national economy