Trudeau will hold a key bilateral meeting with U.S. President Barack Obama at the Asia-Pacific Economic Co-operation Summit - with refugees and climate change top priorities.
Following Friday's terrorist attack in Paris and the looming cancellation of the much-anticipated Global Climate March, activists weigh in on next steps.
Some Canadian political leaders were calling for vigorous action against terrorism including continued involvement in military action against Islamic State after Paris attacks leave 129 dead.
Islamic State claims responsibility for attacks that left 129 people dead and at least 20 hostages seized in French capital on Nov. 13. Only one attacker has been identified so far.