Mr. Chair, I'll comment on this question, but it won't fully answer the question.
CSIS's role is to collect information, analyze it and advise the government, in particular Citizenship and Immigration Canada and Passport Canada. If new information was brought to our attention, we would analyze that information and assess the threat. Then, in the case of the example you gave, we would inform Passport Canada.
CSIS would not have the final say over whether to reissue the passport. CSIS's duty is to constantly reassess the potential threat to Canadians' safety, whether we are talking about information that exacerbates the threat or information that shows that the individual in question doesn't pose the alleged threat or no longer poses that threat.