Unless he presided in some way over that particular document on the FISA court or the FISA court judges themselves are under investigation he’s not a material witness in anyway shape or form.
This is something that has frustrated me since we heard about the FISA abuse. We keep hearing about how the deep staters lied to the poor, pitiful FISA judges. These judges hold the power to subject citizens to anal examination by the federal government. The fact that they are so easily duped makes them at the very least incompetent boobs or at most totally corrupt. If they’re not under investigation they should be.