I read the history of the committee, which has been in existence for two decades now. In my opinion, the objective of the committee is to always be able to reconcile those differences. It is clear that, according to a Supreme Court decision from 1937, I believe, the federal government is not in a position to implement something that is under provincial jurisdiction in an international treaty. The committee's role is to facilitate communication among the many governments in order to ensure that Canada—depending on the type of treaties, I know—is in a position to approve or accept the treaty.
On April 29th, 2010. See this statement in context.