[1] ONCIX replaced the National Counterintelligence Center, which was created in 1994 in response to the arrest of CIA mole Aldrich Ames.

[1] The ONCIX facilitates and enhances US counterintelligence efforts and awareness by enabling the CI community to better identify, assess, prioritize and counter intelligence threats from foreign powers, terrorist groups, and other non-state entities; ensures that the CI community acts efficiently and effectively; and provides for the integration of all US counterintelligence activities.

[5] While ONCIX does not distribute warnings of potential threats to the private sector, it works closely with the FBI's Awareness of National Security Issues and Response (ANSIR) program, the State Department's Overseas Security Advisory Council (OSAC) as well as the Central Intelligence Agency (CIA) to ensure that such warnings are timely made.

[10] In May 2014, DNI James R. Clapper appointed William Evanina, a former FBI special agent with a counterterrorism specialty, as the new National Counterintelligence Executive.

[11] In 2015, Congress made the position subject to the Appointments Clause, making it subject to Senate confirmation,[1] and in 2018 President Trump formally appointed William Evanina to the position of Director of the National Counterintelligence and Security Center.