Final answer:
The Executive Branch, specifically the Secretary of State, is responsible for synthesizing messages from the foreign policy establishment to aid the president's foreign policy decisions.
Step-by-step explanation:
The Executive Branch is responsible for synthesizing the messages coming out of the foreign policy establishment to help the president make his or her own foreign policy.
Within the Executive Branch, the Secretary of State, as the President's principal foreign policy adviser, plays a crucial role in developing and implementing the President's foreign policy.
The State Department, as the lead U.S. foreign affairs agency, supports the President's foreign policy objectives by advancing U.S. interests in the world.