If you want to read a sourced and researched review of the FISA warrant, read this.
https://theconservativetreehouse.com/2018/07/22/a-review-of-the-doj-fbi-fisa-application-release/
Interesting, that he was a FBI asset about 6 months earlier, then declared in the FISA warrant to be "An agent of a foreign power", and then was targeted for recruitment? FISA warrant claims both, but both cannot be true can they?
This is pretty interesting, at the request of the US President?? O asked them to spy on the incoming administration. WOW
Also the date of the request is in Aug 2016. Very interesting stuff there.