Former central banker Mark Carney was sworn in as Canada’s new prime minister on Friday, and will now try to steer his country through a trade war brought by U.S. President Donald Trump, annexation threats and an expected federal election. Carney, a former Goldman Sachs executive with no experience in politics, becomes Canada’s 24th prime minister. He said protecting Canadian workers and their families in the face of unjustified trade actions and growing the economy will be his top priorities.