Detailed Instructions: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Q: The National Security Advisor , officially known as the Assistant to the President for National Security Affairs , serves as the top advisor to the President of the United States on national security issues .
A:
The Assistant to the President for National Security Affairs ( APNSA ) , commonly referred to as the National Security Advisor ( NSA ) or at times informally termed the NSC Advisor , is a senior aide in the Executive Office of the President , based at the West Wing of the White House , who serves as the chief in-house advisor to the President of the United States on national security issues .