Impeachment articles filed for his illegal behavior for abuse of power in the illegal Arctic Frost campaign against the Biden WH political opponents.
Boasberg was the rubber stamper for anything the Dems wanted (and shamelessly remained so after the election while knowing his previous involvement and not recusing himself on rulings he made against the Trump WH).
This is a surprise to absolutely no one.
Link: https://www.foxnews.com/politics/trump-foe-boasberg-hit-articles-impeachment