The 44-year-old Trudeau -- a former schoolteacher and the son of a popular prime minister -- immediately saw his international profile rise upon taking office on November 4, and he still enjoys strong support at home.
He has touted a multilateral foreign policy, and a more transparent governing style than his predecessor Stephen Harper, who was seen as prickly, awkward and more at home plowing through economic theory than glad-handing voters.
UN chief Ban Ki-moon is expected to praise Canada's shift in a visit to Ottawa on Thursday.
The economy, however, has cast a pall over Trudeau's self-professed "sunny ways."
Canada emerged from a mild recession in September in the middle of the election campaign, but consumer confidence soon faded as oil prices and the Canadian dollar sank to new recent lows, leading to thousands of job losses in the country's oil and gas sector.
The new government was forced to backpedal on its pledge to resettle 25,000 Syrian refugees by the end of 2015 and on its fiscal plans, while taking heat over its climate and counterterrorism strategies.
In parliament, opposition leader Rona Ambrose accused the government of "stepping back from the fight (against the Islamic State group) when our allies are stepping up."
"The reality is that when we talk about Canada's new approach to fighting ISIS, Canada is not back, Canada is backing away," she said.
