What I am suggesting is that we demonstrate the reason for it. If there is an inadequacy in testimony, or if it is believed that an area was problematic or disputed, that should be brought to either the steering committee or the committee of the whole to demonstrate that and provide the reason to bring another witness back. There is no difficulty there whatsoever.
But just to call someone.... I think the committee should have some indication as to why that person is coming back, so that we could all prepare. Just to start calling the witness back based on any particular member's thought that they wanted more information is not enough. It should be shared with the committee and then we move forward. If we wish to call them back, we will, but not ad hoc.