The NSC is chaired by the President. Its regular attendees (both statutory and non-statutory) are the Vice President, the Secretary of State, the Secretary of the Treasury, the Secretary of Defense, and the Assistant to the President for National Security Affairs. The Chairman of the Joint Chiefs of Staff is the statutory military advisor to the Council, and the Director of National Intelligence is the intelligence advisor. The Chief of Staff to the President, Counsel to the President, and the Legal Advisor to the NSC are invited to attend any NSC meeting. The Attorney General and the Director of the Office of Management and Budget are invited to attend meetings pertaining to their responsibilities. The heads of other executive departments and agencies, as well as other senior officials, are invited to attend meetings of the NSC when appropriate.
The National Security Council was established by the National Security Act of 1947 (PL 235 – 61 Stat. 496; U.S.C. 402), amended by the National Security Act Amendments of 1949 (63 Stat. 579; 50 U.S.C. 401 et seq.). Later in 1949, as part of the Reorganization Plan, the Council was placed in the Executive Office of the President.
https://www.whitehouse.gov/nsc/