The Assistant to the President for National Security Affairs (APNSA), commonly referred to as the National Security Advisor (NSA), is a senior aide in the Executive Office of the President, based at the West Wing of the White House. The national security advisor serves as the principal advisor to the President of the United States on all national security issues.

The Executive Office of the President of the United States (EOP) comprises the offices and agencies that support the work of the president at the center of the executive branch of the United States federal government. The office consists of several offices and agencies, such as the White House Office, the National Security Council, and the Office of Management and Budget.