Indeed, Mr. Poilievre had this to say in 2010 regarding the principle of ministerial responsibility:
Prime Ministers typically do not testify before committees—that matter is not in dispute. Therefore the Prime Minister does send a designate to represent him. In this case we have Minister Baird.
That was on Tuesday, May 25, 2010. He also said the following that day:
However, ministers are accountable and answerable to Parliament for government policies, decisions, and operations. Ministerial staff are ultimately accountable through their minister.
Do you agree with Mr. Poilievre's statement and this long-standing parliamentary principle?