But under the FISA rules, B cannot be “known”, unless they are unmasked through 702 requests through the NSA.
FISA gives them great power, but also is supposed to have restrictions.
Did Carter Page discuss a crime with everyone who was unmasked?
Rules?
Rules?
Who was following the rules.... and when they didn’t, who was watching them?
Answer: Nobody
There is also the old LEO game where when information is illegally obtained, they find another way to claim they knew it, including the infamous anonymous phone call tip.