Let me just interject here, because committee has to respect our public servants. This is right out of Marleau and Montpetit, at page 863:
The obligation of a witness to answer all questions put by the committee must be balanced against the role that public servants play in providing confidential advice to their Ministers. The role of the public servant has traditionally been viewed in relation to the implementation and administration of government policy, rather than the determination of what that policy should be.
A point of order?