The Constitution recognizes three distinct branches of government. This “fourth branch” would be extra-constitutional and not bound by the Constitution. Who would control it? The executive branch? The legislative branch? The judicial branch? Or would it be a rogue that answers to no one but itself.
It appears it would be your last comment.
"Or would it operate as a rogue that answers to no one but itself" ,
as the current "Just-Us" department under Biden does now ?
That's a valid question