A parliamentary question

From Parliament:

2532 (2013). Hon Trevor Mallard to the Minister for Economic Development (19 Mar 2013): Has he or any predecessor expressed a lack of confidence or indicated a relationship breakdown with any staff of any department, agency or ministry for which he has responsibility to the staffer’s Chief Executive or their officials since 19 November 2008; if so, on how many occasions, is he aware of or has he received any reports on what occurred, and if so, what did occur?
Hon Steven Joyce (Minister for Economic Development) replied: No. With regard to any predecessor in my portfolios, the only instances I am aware of relate to comments made by Hon Trevor Mallard, describing an official as incompetent.
That old saying about throwing stones in glasshouses.