So if they are already using FISA, and have been for decades, then they have dirt on everyone. If Trump is Squeaky clean, then FISA can be Ai Ki Do'd aka Boomerang'd back at the Deep State, whom fuck kids and use adrenochrome.
Depends how big the fire is. Maybe keep the fire going and redirect it somewhere useful and make use out of something bad.
With or without FISA, you will be spied on. Through FISA is a 'legal' way to present to the public how the dirt was collected under 9 / 11 guise. FISA extended for 2 more years, which most of it will be in Trump's presidency so he can unload FISA on their heads which was intended to work on Trump, but couldn't because Trump is a Squeaky clean Saint. Then Trump can let FISA expire once it isn't needed.
Think mirror. The Republicans that voted for this intend to cover for those that will interfere in elections. FISA can be used to log events / communications during the Election.