Answer:
The United States National Security Council
Explanation:
The US National Security Council was established in 1947 by former president Harry Truman. It serves as an advisory body to the president, and it´s part of the executive branch.
Several senior officials participate in the meetings of the US National Security Council, for example:
The meet in the Situation Room of the White House, and have the power to order things such as the killing of an individual who is suspected to be a terrorist.