Read this: An example of the first view is the regulation of attorneys and judges, and the establishment of rules for the conduct of the courts, by the Congress and in the states the legislatures. Although in practice these matters are delegated to the Supreme Court, the Congress holds these powers and delegates them to the Supreme Court only for convenience in light of the Supreme Court's expertise, but can withdraw that delegation at any time.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): In practice, what is delegated to Congress?
unanswerable