And BTW, there are some myths from foreign propaganda that should be debunked. Islamic State is against the Saudis. IS gets its funding not from nations but from many individuals in several Arab countries, by taking resources, etc.
IS is popular with many individuals around the Middle East. It’s easy enough to get good information from better sources than the propaganda sites of expansionist nations that have been threatening to nuke us for years.
Islamic State explains why it doesnt attack Israel (yet)
https://www.timesofisrael.com/islamic-state-explains-why-it-doesnt-attack-israel-yet/
The proper role for the CIA and NSA would be to discover the identities of the people giving financial support to ISIS. Then go kill them, no matter who they are, no matter where they are. Even if they are members of the super-rich, or of royal families.