Canada's new Prime Minister Justin Trudeau (bottom row C) poses with his cabinet after their swearing-in ceremony at Rideau Hall in Ottawa

Justin Trudeau is sworn-in as Canada's 23rd prime minister during a ceremony at Rideau Hall in Ottawa

Justin Trudeau's wife Sophie Gregoire (R), son Xavier and mother Margaret (L) hold hands before he is sworn-in as Canada's 23rd prime minister during a ceremony at Rideau Hall in Ottawa

General David Johnston watches Justin Trudeau being sworn-in as Canada's 23rd prime minister during a ceremony at Rideau Hall in Ottawa