It seems to me it's linked to the difference between a parliamentary-type system, in which you have ministerial responsibility and the executive resides within the legislative branch, and a congressional-type system or a complete separation of power in the U.S. Maybe a better question to ask is this. Is there a parliamentary system that has a different model from what is being used in the U.K. or Australia or being contemplated here in this legislation?
On November 24th, 2014. See this statement in context.