Question: Roberto Gil Zuarth served as private secretary to which Mexican president who is a member of the PAN party?

Context paragraphs:
Zelda La Grange: Zelda la Grange (born 29 October 1970) is a former private secretary to Nelson Mandela.  La Grange was born in Pretoria, South Africa.  She completed a 3-year National Diploma at the Tshwane University of Technology.  From 1994 until 1996, she served as a typist for Mary Mxadana, private secretary to Nelson Mandela, the newly elected post-apartheid President of South Africa.  In 1996, she was promoted to assistant private secretary, and in 1999 she was again promoted to Private Secretary to the Office of the President.  She was a founding staff member of the Nelson Mandela Foundation which served as post-Presidential office for Nelson Mandela.

Jesús Marcelo de los Santos: Jesús Marcelo de los Santos Fraga (born December 15, 1948) is a Mexican politician, member of the PAN party, and Governor of the state of San Luis Potosí (2003–2009).

Vakkom Bharathan: Vakkom Bharathan (1 November 1926 – 12 July 2002) was an attorney, CPI M leader and trade union leader of Kerala, India.  He held various government administrative positions in Kerala.  He was elected as the first panchayat president of Vakkom in 1953.  He served as chairman of Plantation Corporation of Kerala Ltd in 1980.  In 1976 he was private secretary to Kerala Industries Minister, K. R. Gowri Amma.  Finally, he was private secretary to Kerala Industries Minister Susheela Gopalan in 1996.

Roberto Rodríguez (Mexican film director): Roberto Rodríguez Ruelas (Mexico City, 1909-1995) was a Mexican film director.  Brothers Roberto and Joselito Rodríguez were working in Hollywood as sound engineers in 1931 when Mexican President Pascual Ortiz Rubio, on an official visit to the city of Los Angeles, came to hear of their work and personally invited them to return to Mexico to film a sound-movie using the brothers' sound system - the result was the film Santa, 1932.

Felipe Calderón: Felipe de Jesús Calderón Hinojosa, GCB, R.E. (] ; born 18 August 1962) is a Mexican politician who served as President of Mexico from 1 December 2006, to 30 November 2012.  He is a member of the National Action Party ("Partido Acción Nacional", PAN), one of the three major Mexican political parties.

Francisco Lemus Muñoz: Francisco Isaías Lemus Muñoz Ledo (born 23 February 1961) is a Mexican politician affiliated with the National Action Party. In 2003 he was Deputy plurinominal Local PAN in Guanajuato LVIII Legislature .  President of the Commission of Public Works and Urban Development ; Member of the Commission of Education, Culture and Publishing Affairs ; Member of the Committee on Environment and Ecology.  As of 2014 he served as Deputy of the LIX Legislature of the Mexican Congress representing Guanajuato, 1991 candidate for alderman of the municipality of Apaseo El Grande, Guanajuato 1994 candidate for mayor of Apaseo El Grande, Guanajuato, PAN 1996 active members, 1997 PAN candidate of a local deputy Guanajuato, from 1997 to 2000 Secretary of organization of CDM PAN Apaseo el Grande, Guanajuato, from 1997 to 2002 Political Advisor in the CDM PAN Apaseo el Grande, Guanajuato, from 2001 to 2003 State Counsel in the CDE PAN in Leon, Guanajuato

Roberto Gil Zuarth: Roberto Gil Zuarth (born in Tuxtla Gutiérrez, Chiapas, 10 October 1977) is a Mexican politician affiliated with the PAN.  He was Undersecretary of the Interior.  He also served as Deputy between 2009 and 2011 during the 61st Legislature.  He contended in 2010 for the presidency of the National Action Party against Gustavo Madero Muñoz.  He was Private Secretary to Mexican President Felipe Calderón.  He currently serves as Senator of the LXIII Legislature of the Mexican Congress.  Since September 1, 2015 he is the President of the Mexican Senate.

Alfred Xuereb: Alfred Xuereb (born 14 October 1958 in Victoria on the Maltese island of Gozo) is an Honorary Prelate of the Roman Catholic Church, and first private secretary of Pope Francis.  Before being selected, he had served, next to the private secretary Georg Gänswein, as second private secretary of Pope Benedict XVI.

Tessa Munt: Tessa Jane Munt (born 16 October 1959) is a British Liberal Democrat politician.  She was the Member of Parliament (MP) for Wells in Somerset from 2010 – 2015 and had previously served as the Parliamentary Private Secretary (PPS) to the Secretary of State for Business, Innovation and Skills, Vince Cable.  Following the appointment of Jo Swinson as PPS to the Leader of the Liberal Democrats, Nick Clegg, Tessa was appointed as Parliamentary Private Secretary to Liberal Democrat Secretary of State for Business, Innovation and Skills, Vince Cable.

Thawisan Ladawan: Thawisan Ladawan (Thai: ทวีสันต์ ลดาวัลย์ ) (26 January 1923 – 7 April 2006) was husband of Busba Kitiyakara (younger sister of Queen Sirikit), a member of King Bhumibol Adulyadej's Privy Council, and for 26 years, principal private secretary to the King.  Thawisan attended Vajiravudh College and graduated from the inaugural class of Thammasat University in 1938.  He worked in several capitals, including Paris and Brussels, and earned a Diplome d'Etudes Superieures de Droit International Public from Paris University in 1954.  He became Deputy Director-Deneral of the Protocol Department before departing in 1968 to serve as Deputy Principal Private Secretary to Bhumibol.  A year later he became Bhumibol's Principal Private Secretary, and was later appointed to the Privy Council.  He died at the age of 83 due to chronic liver disease.

Supporting paragraphs: Roberto Gil Zuarth Felipe Calderón
Answer: Felipe Calderón