Thank you very much, Mr. Chair.
If you refer to page 1068 of O'Brien and Bosc, paragraph 2 says:
Particular attention is paid to the questioning of public servants. 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. Consequently, public servants have been excused from commenting on the policy decisions made by the government.
I believe trying to get advice that the public servant may have given to Treasury Board would fall under this and would fall under page 1068, Mr. Chair.