In answer to that, Mr. Butts, of course, resigned in what I think many people saw as disgrace before he brought that testimony. I would think that even senior staffers in the Prime Minister's Office or in the finance minister's office would be very prudent in avoiding any appearance before any committee and making any public statements, given what they saw as the fate of the principal secretary and the Clerk of the Privy Council, who were two of the most senior individuals supporting the Prime Minister.
I think that they have not been given an opportunity. An invitation would certainly give them that opportunity. As I suggested, a letter from the chair would invite the Prime Minister to remove any constraints there might be on those individuals to speak the truth here, before a civil and safe venue.