I think the example that we have—and I am sure most of us will remember—was when the parliamentary committee wanted to review the situation of Afghan detainees. That led to Speaker Milliken's ruling. I think that was a very difficult time. This was an ongoing national security and national defence issue, a military issue. At the same time, grave concerns were expressed by many involved, in terms of what was happening with the treatment of Afghan detainees. There was significant resistance to providing information, based on cabinet confidences, national security issues, and so on.
The question becomes, was it something that was appropriate for parliamentarians to be able to scrutinize at the time? Eventually, a means was found in order to properly do this work.
That's a very recent example of something that I think would have seen the weighing of the national security interests and the public interest at play.