I think that as committee members we should all be cognizant of the fact that we asked for this witness. The same is true that points of debate should not be made through points of order. Whomever we call as a committee, it's our choice to call someone as a committee. If we call them, it's because they have a particular point of view that we want to have shared with the committee.
I don't know if it's relevant to be challenging credentials at this point in time. If there was a challenge to be made, it should have been made before the witness was called to appear before us.