Which clause of the United States constitution prohibits the 18th United States Secretary of Transortation from holding the office of President of the United States?
the natural born citizen clause
Title: Saxbe fix
Passage: The Saxbe fix , or salary rollback, is a mechanism by which the President of the United States, in appointing a current or former member of the United States Congress whose elected term has not yet expired, can avoid the restriction of the United States Constitution's Ineligibility Clause.  That clause prohibits the President from appointing a current or former member of Congress to a civil office position that was created, or to a civil office position for which the pay or benefits (collectively, "emoluments") were increased, during the term for which that member was elected until the term has expired.  The rollback, first implemented by an Act of Congress in 1909, reverts the emoluments of the office to the amount they were when that member began his or her elected term.
Title: Equal Opportunity to Govern Amendment
Passage: The Equal Opportunity to Govern Amendment, also known as the Hatch Amendment, is a United States constitutional amendment proposed in July 2003 by Senator Orrin Hatch (R-Utah) to repeal the natural born citizen clause prohibiting citizens who were naturalized from holding the office of President or Vice President of the United States.  Hatch's amendment would allow anyone who has been a US citizen for twenty years to seek these offices.  In the wake of the California recall election, 2003, this proposal was widely seen as an attempt to make California Governor Arnold Schwarzenegger (born in Austria and naturalized in 1983) eligible for the presidency and is sometimes nicknamed "Arnold bill" or "Amend for Arnold".  However, there are other politicians who were not born as American citizens and therefore would benefit from such an amendment.  Notables include Michigan governor Jennifer Granholm (born in Canada, naturalized in 1980), former Florida Senator Mel Martinez (born in Cuba), former United States Secretary of State Madeleine Albright (born in Czechoslovakia), former Vermont governor Madeleine Kunin (born in Switzerland), and current Secretary of Transportation Elaine Chao (born in Taiwan).  The text of the amendment reads as follows:
Title: Elaine Chao
Passage: Elaine Lan Chao (; born March 26, 1953) is an American politician who is the 18th and current United States Secretary of Transportation.  A member of the Republican Party, she was previously a cabinet member in the administration of George W. Bush.
Elaine Chao Equal Opportunity to Govern Amendment