The US Intercepts the call. They cant use it. Brennan calls GHCQ and pulls a favor. He get them to send him the transcript on the side. ILLEGAL. He takes parts of the conversation and sends them to Peter Strzok, thinking they can use this and never reveal how they got it..
Strzok uses the cuts to interview Flynn. They got nothing on Flynn. They end up having to get him on the fabricated lying charge. HOWEVER ..
Someone in the FBI leaked the cuts without talking with Brennan. This put Brennan in a HUGE bind. He used illegally obtained intelligence.
When Hannigan, the British GHCQ guy, found out, he knew his career was over. He resigned.
John Brennan is the guy who was running this.
How much do you want to bet it was either Strzok or Page that leaked it. They altered the 302...basically enhanced it, and I read today that the electronic communication that Strzok put together to start Crossfire Hurricane, contained a "phrase" that was different to what Australian high commissioner to the United Kingdom Alexander Downer had documented in a memo after his meeting with Papadopoulos. It wouldn't surprise me if Strzok added text to Downer's statement to enhance the importance of the investigation.
Here's the link to the story regarding the FOIA document released by Judicial Watch:
Watchdog Group Publishes The FBI Document That Got Crossfire Hurricane Started
And here's the link to the document: