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A number of former security agents and lawmakers participated in the exercise among whom former president George W. Bush's Homeland Security chief Michael Chertoff acted as National Security Advisor former Director of  National Intelligence   John Negroponte  as Secretary of State and former White House Homeland Security Advisor Fran Townsend as Secretary of Homeland Security .
 employee of: National Intelligence, John Negroponte
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 employee of: National Intelligence, John Negroponte