Non-governmental agents have been used in diplomatic missions since the beginning of the Union. There's even a common term for it, "backchannel."
If someone anyone, drops a subpoena or document request on me I have every right to seek judicial review. And because the scope of separation of powers and presidential privilege is so vague in the law many say the president would be derelict in his duty to not seek judicial review. Since giving in to all Congressional demands would be precedent setting I would agree.
The key elements in human thinking are not numbers but labels of fuzzy sets. -- L. Zadeh
