<Li> Jason Ralph as Harrison Dalton (seasons 1--2), son of President Dalton and long - time friend of Stevie McCord . In season 1, it is revealed Harrison has a drug addiction and is color blind . In season 4 it is revealed that he is back in rehab . </Li> <Li> Cotter Smith as Darren Hahn (seasons 1--2), President Dalton's first known National Security Advisor . </Li> <Li> Patrick Breen as Andrew Munsey (season 1), the Director of the CIA and a protégé of President Dalton . </Li> <Li> Nilaja Sun as Juliet Humphrey (season 1; guest season 3), a former CIA analyst, friend and colleague of Elizabeth and Isabelle . </Li>

Who plays the cia director on madam secretary