Sean Casey

Canada is preparing retaliatory tariffs in response to U.S. president-elect Donald Trump's threat to levy a 25 per cent import tax on all Canadian goods, and Ontario Premier Doug Ford threatened to withhold the province's energy, which it exports to five states.

Liberal MP Sean Casey is the first to publicly confirm that he has signed a letter calling on Prime Minister Justin Trudeau to resign, arguing it would be in the best interests of the country to let someone else take the reins.

After losing a Toronto-area riding the Liberals have held for more than three decades, Prime Minister Justin Trudeau said on Tuesday he heard the "concerns and frustrations" of voters.