Pegasus spyware is NSO's premier spying tool as it promises that it can reliably overcome the encryption of any iPhone or Android smartphone to covertly infiltrate a user's calls, texts, pictures, and whereabouts.
www.thesun.co.uk
The fbi certainly never use it illegally to surveil Americans it would be used much like fisa warrants.

FBI says it tested infamous Pegasus spyware that can silently crack iPhones
THE FBI says it tested Israeli-based NSO Group’s Pegasus spyware for potential use in criminal investigations. The US Federal Bureau of Investigation (FBI) confirmed it tested Pegasus spyware…
