TORONTO -- Mark Carney's political career is only months old, and it's already been a roller-coaster ride. The former central banker appeared destined to become one of Canada's shortest-serving prime ministers until President Donald Trump picked a fight with the U.S.'s northern neighbor.

Mark Carney’s Liberal Party is holding on to a narrow lead in opinion surveys with less than a week to go before Canada’s election day, as US tariff threats remain a top issue in the campaign.