I would not cooperate with subpoenas until the whistleblower testifies in public.
I like that position. No “whistleblower” public testimony no testimony from anyone else on this matter.
I’m very skeptical the “whistleblower” will ever testify since Trump released the transcript. Schiff will say the “whistleblower’s” claims have been confirmed. Just a few problems with that, that would be false and the “whistleblower” will have to name names - which he/she will not. They couldn’t possibly have protection for their actions.