Which federal agency has prioritized protection from terrorism as its number one goal?

The Federal Bureau of Investigation (FBI) has prioritized protection from terrorism as its number one goal due to its role in national security and counterterrorism efforts. After the September 11 attacks in 2001, the FBI shifted its focus to prevent future terrorist threats by gathering intelligence and coordinating with other government agencies. The FBI's responsibility encompasses investigating and preventing domestic terrorism, as well as working closely with federal, state, local, and international partners to address and mitigate terrorist activities.

The emphasis on counterterrorism reflects the FBI's unique position as both a law enforcement agency and an intelligence entity, allowing it to tackle threats swiftly and effectively within the United States. The other agencies listed have distinct missions that focus more on their specific areas of expertise; for instance, the Secret Service is primarily tasked with protecting national leaders and safeguarding the nation's financial infrastructure, the CIA focuses on foreign intelligence and national security issues, and the DEA's primary mission is to combat drug trafficking and abuse.