"On April 4, 2017, the Trump Administration issued National Security Presidential Memorandum (NSPM)-4: Organization of the National Security Council, the Homeland Security Council, and Subcommittees. NSPM-4 details how the executive branch intends to manage and coordinate national and homeland security issues among relevant departments and agencies. This NSPM augments an earlier articulation from the Trump Administration regarding the management of national security matters, as expressed in NSPM-2, which was issued on January 28, 2017. This report offers a brief historical overview of the formation of the National Security Council (NSC), clarifies the terms and structures associated with it, and provides an overview of what changed with the issuance of NSPM-4 on April 4, 2017. In addition, it compares NSC structures for each President going back to the George H.W. Bush Administration."
CRS Report for Congress, R44828
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html