The point Mr. Christopherson is making is that on some occasions a member of the committee has been a member who's not from the two officially recognized opposition parties. For instance, it could be Elizabeth May. It could be an independent, because occasionally the committee will make a motion and allow these people to be committee members. All Mr. Christopherson is proposing is that when we have a quorum that allows an opposition member, the opposition member has to be from one of the two official parties.
On January 26th, 2016. See this statement in context.