Trump was publicly against FISA.
Think about it.
. FISA or no FISA...if the government wants to spy on Americans without a warrant...they will do it...I think Brennan apologized for such actions.
https://www.cnn.com/2014/07/31/politics/cia-spying-senate-apologize/index.html
He signed the authorization in 2018.
https://reason.com/2024/04/15/donald-trumps-cowardice-over-warrantless-spying/