Liberal officials confirmed the prime minister will only attend two debates.
Police were forced to intervene with crowds prior to his appearance at the Munk Debates.
The debate will take place on the eve of U.S. midterm elections in November.
Right now, 71 per cent of Canadians do not want Canada to accept above the original target of 25,000 Syrians. The warm feeling of moral righteousness is not particularly useful for devising a policy at a time when 60 per cent of Americans agree with Donald Trump's proposal to ban entry of all non-citizen Muslims to the United States.
The absence of female voices in public policy debates is not simply a matter of demographic representation. Without women's voices, and more specifically feminist voices, we lose the perspective that strong women bring to the table and we lose the potential for far better politics and policies that champion the rights and interests of both women and men.
Each of the leaders would present a different face of Canada to the world. Mulcair clearly demonstrated a new NDP approach to the realm of foreign affairs for Canada. Trudeau worked hard to dig into his opponents, but didn't present himself as a possible world leader. Stephen Harper managed to stay out of any major trouble and reinforced his image as a "tough on terror" PM.
The issue of Israel and Palestine, however, was virtually untouched.
Said Trudeau: "We have a prime minister that doesn't like Barack Obama."
Monday's Munk Debate is probably going to generate a lot chatter about in the small circles in Canada that actually care about foreign policy. That the three candidates themselves had trouble staying on the foreign side of issues and had to be dragged, kicking and screaming, back to foreign policy is only one indication.