Try the constitutional process......
This "unprecedented request" is neither a request nor unprecedented. A request by congressional committe has the same authority as a subpoena and respondents are sworn, and testify under oath. Failure to conform to this "request" will place you in contempt and jail.
Production of documents has always been part of the confirmation process and is nothing new. It is the consent portion of the "advise and consent" obligation that is the congressional role--not the preznit's.
What is new is the new Retardlican administration with its attempt to rule as annointed monarchy and by-pass congress if they appear inconvenient.
Publius