HSI Effectively Contributes to the FBI's Joint Terrorism Task Force, but Partnering Agreements Could Be Improved (REDACTED) [open pdf - 7MB]
From the Document: "A top priority of DHS is to protect America from terrorism. However, the FBI is the lead law enforcement agency in combatting terrorism and maintaining operational oversight of the JTTF [Joint Terrorism Task Force]. As such, ICE's [Immigration and Customs Enforcement] HSI [Homeland Security Investigations] has allied with the FBI's JTTF to carry out the counterterrorism mission. We conducted this audit to determine if ICE HSI is effectively contributing to the FBI's JTTF."
Department of Homeland Security, Office of Inspector General, Report No. OIG-20-59
Department of Homeland Security, Office of Inspector General: https://www.oig.dhs.gov/