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?   

<P0-S0>  He served as the 28th Governor of Ohio and as United States Secretary of the Interior. <P0-S1>  However, Cox was opposed by Republican Party managers, who ultimately convinced Grant to cease civil service reforms. <P0-S2>  Cox retired and did not return to active politics, using his time to write several books on Civil War campaigns which remain today respected histories and memoirs. <P0-S3>  In 1872 Cox joined the Liberal Republicans in opposition to Grant's renomination. <P0-S4>  But Johnson declined. <P0-S5>  Secretary Cox advocated a lasting, honest, and comprehensive Indian policy legislated by Congress after the Piegan Indian massacre. <P0-S6>  Secretary of Interior Cox implemented the first civil service reform in a federal government department, including examinations for most clerks. <P0-S7>  President Grant and Secretary Cox were at odds over the fraudulent McGarahan Claims and the Dominican Republic annexation treaty. <P0-S8>  Congressman Cox supported President Hayes's reform efforts, but his term as Congressman was unsuccessful at establishing permanent Civil Service reform. <P0-S9>  As Governor of Ohio, Cox sided for a time with President Andrew Johnson's Reconstruction plan and was against African American suffrage in the South, though he supported it in Ohio. <P0-S10>  Grant initially supported Cox and civil service reform, creating America's first Civil Service Commission. <P0-S11>  Although Cox was a reformer, Grant had believed Cox had overstepped his authority as Secretary of Interior and had undermined his authority as President. <P0-S12>  When Ulysses S. Grant became President he nominated Cox Secretary of Interior and Cox immediately accepted. <P0-S13>  Seeing himself caught between Johnson and the Radical Republicans, Cox decided not to run for reelection. <P0-S14> Jacob Dolson Cox, (Jr.) (October 27, 1828August 4, 1900) was a statesman, lawyer, Union Army general during the American Civil War, and later a Republican politician from Ohio. <SEP> <P1-S0> Patricia Roberts Harris (May 31, 1924March 23, 1985) served in the American administration of President Jimmy Carter as United States Secretary of Housing and Urban Development, and United States Secretary of Health, Education, and Welfare (which was renamed the Secretary of Health and Human Services during her tenure). <P1-S1>  She was the first African American woman to serve in the United States Cabinet, and the first to enter the line of succession to the Presidency. <P1-S2>  She previously served as United States Ambassador to Luxembourg under President Lyndon B. Johnson, and was the first African-American woman to represent the United States as an ambassador. <SEP> <P2-S0> 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. <P2-S1>  He was a significant figure in the early Cold War era, advocating an aggressive stance against Communism throughout the world. <SEP> <P3-S0> Donald Read Heath (August 12, 1894 – October 15, 1981) was a member of the United States Foreign Service for more than four decades including service as the Ambassador to Cambodia (1950–1954), Laos (1950–1954), Vietnam (1952–1955), Lebanon (1955–1957) and Saudi Arabia (1958–1961). <P3-S1>  During his tenure as Ambassador to Vietnam, Heath advocated and carried out American policy under Secretary of State John Foster Dulles that helped set the stage for American military involvement.