You obviously are not aware of FISA judges? There is no expectation of any digital privacy whatsoever. That’s why any decent lawyer doesn’t use a computer for communication or recording of conversations with clients. A yellow notepad with cryptic references is all they use. All computer or messaging data is sent by low level staffers for filing briefs, court filings, and so on.
FISA judges are not boogiemen.
No one with a lick of sense sends anything they want secret over the internet without outrageous encryption. And even then they’re just kidding themselves.