The National Security Council (NSC) is a group of top foreign policy advisors and relevant cabinet officials that advise the president on foreign policy and national security issues. Who is the official chair of the NSC?

The president

Explanation:

The National Security Council (NSC) is an institution completely subordinate to the president, who represents the official chair of that institution.

The NSC has an administrative character and is responsible for activities involving advisory, coordination and initiative in matters of external policies and national security, where it has an extremely important role in the formation of policies involving these elements.