If you mean by “exclusion”, preventing them from entering Canada, that is definitely possible. I want to link this to your question about the Magnitsky Act. One of the unintended consequences of doing both of those too often and to too many people is that you're actually legitimizing these individuals. In some cases, it might be a badge of honour to be banned from entering Canada; it might give them more legitimacy back home. We have to think about not giving them a platform by doing that. Yes, we can ban individuals from coming to Canada, but we cannot ban Canadians from re-entering. It is a possibility and we do that. Our list tends to always match that of the U.S. and the EU.
On October 19th, 2016. See this statement in context.