Question: During his tenure as Ambassador to Vietnam, Donal Read Heath advocated and carried out American policy under a United States Secretary of State for what president?   
Sentence (from "John Foster Dulles"): John Foster Dulles ( ; February 25, 1888May 24, 1959) served as United States Secretary of State under Republican President Dwight D. Eisenhower from 1953 to 1959.
Relevant evidence: Yes