Rumors that John O. Brennan might be offered job to be head of C.I.A.
I do not think that will happen.
He worked for Bush - see the details regarding his job with Bush on the right side of the page on the link below.
John O. Brennan (born September 22, 1955) is chief counterterrorism advisor to U.S. President Barack Obama; officially his title is Deputy National Security Advisor for Homeland Security and Counterterrorism, and Assistant to the President. His responsibilities include overseeing plans to protect the country from terrorism and respond to natural disasters, and he meets with the President daily. Previously, he advised Obama on foreign policy and intelligence issues during the 2008 presidential campaign and transition. Brennan withdrew his name from consideration for Director of the CIA in the new Obama administration over concerns about his support for the use of "enhanced interrogation" techniques by the CIA under President George W. Bush. Instead, Brennan was appointed Deputy National Security Advisor, a position which did not require Senate confirmation.
After leaving government service in 2005, Brennan became CEO of The Analysis Corporation, a security consulting business, and served as chairman of the Intelligence and National Security Alliance, an association of intelligence professionals. Brennan's 25 years with the CIA included work as a Near East and South Asia analyst, as station chief in Saudi Arabia, and as director of the National Counterterrorism Center.