Rule 26.02 in part:(1) IN GENERAL. Parties may obtain discovery regarding any matter, not privileged, which is relevant to the subject matter involved in the pending action, whether it relates to the claim or defense of the party seeking discovery or to the claim or defense of any other party, including the existence, description, nature, custody, condition and location of any books, documents, or other tangible things and electronically stored information, i.e. information that is stored in an electronic medium and is retrievable in perceivable form, and the identity and location of persons having knowledge of any discoverable matter. It is not ground for objection that the information sought will be inadmissible at the trial if the information sought appears reasonably calculated to lead to the discovery of admissible evidence.
Reasonably calculated to lead to discoverable evidence is a very wide door to make it through. You would have to show it would not do so to have the request denied.
Nothing herein is intended to create an attorney client relationship and the response is intended to provide generally a broad response to the area posed by the question. Each question is governed by unique facts and no answer provided is intended to specifically answer the question, but is a general overview of the area of law contained in the question.