Final answer:
The Secretary of State is most likely to brief the president on national security issues due to their role as the nation's chief diplomat and involvement in foreign policy.
Explanation:
Secretary of State is most likely to brief the president on issues of national security. The Secretary of State serves as the nation's chief diplomat, oversees the Foreign Service, and traditionally leads in U.S. foreign policy. In contrast, the Secretary of Transportation, Secretary of Homeland Security, and Secretary of Defense have roles that are not primarily focused on national security.
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