There seems to be a lot of history being re-written in these comments.  As a knowledgeable and long-time Conservative for over a half century let me set out the facts.

The Diefenbaker government  ended the racism in our immigration legislation and opened up the refugee system to all nationalities.  During World Refugee Year in 1959 Canada waived its medical requirements and admitted refugees suffering from tuberculosis.

The Father of Canadian Multiculturalism?  Diefenbaker appointed Conservative Senator, Professor Paul Yuzyk who browbeat Pearson and then Trudeau into accepting Canada was not just English and French but a multicultural nation.  See the annual Paul Yuzyk Award for Multiculturalism awarded in his honour.

The Conservative government of Joe Clark initiated the massive airlift of the Vietnamese Boat People - 110,000 Vietnamese refugees arrived.

And it was the Mulroney government who put in place our current hearing process for refugee claimants after the 1985 Singh case.