FISC learned the FBI had omitted material facts from FISA warrant applications in more than 75 terrorism cases that dated back to the late 1990s.
IOW....before Mueller was Director. It’s the same thing as Wray being called to testify about the conduct of Strzok, Page, Ohr, and others. The FISA court, like Congress, wanted to know what corrective action was being taken. Bongino knows this.