Remember, Boasberg illegally issued non-disclosure orders on the pretext that the Senators being spied on might destroy evidence or intimidate witnesses.
Except, the AF team had no intention of bringing actual charges.
Which means they were spying for spying's sake. Last sentence in the body of the email:
...given my understanding of the low likelihood that any of the Members listed below would be charged, the litigation risk should be minimal here."
https://x.com/ChuckGrassley/status/1993403533757182272