That question has been raised many times in recent decades.
One thing that people don't necessarily know about CSIS is that it has a significant international component. Even though it's a single agency that has been given a very specific mandate, it isn't limited by geographical constraints when gathering intelligence on threats against Canada. CSIS agents are thus posted temporarily or permanently around the world to do the work that's asked of them.
Many countries have developed their procedures by establishing two agencies. Could there be a reason to review CSIS for that purpose? As I told you, the review currently under way should be quite open.
However, to be very honest with the member, I'd say this isn't necessarily the first solution I would consider for correcting potential deficiencies and better protecting Canadians.