Question: Under which president did this American retired politician and businessman serve as Secretary of Defense most recently that St. Petersburg Democratic Club's controversial "The Gabber" advertisement focused on?
Sentence (from "Donald Rumsfeld"): Rumsfeld served as the 13th Secretary of Defense from 1975 to 1977 under President Gerald Ford, and as the 21st Secretary of Defense from 2001 to 2006 under President George W. Bush.
Relevant evidence: Yes