Obama says will continue to 'steadily chip away at the numbers in Guantanamo'; will try to work with Congress before saying anything about executive authority
Obama says US needs to balance security and privacy; will working with technology community, in an appropriate way, to try to discern possible threats
Obama says he is optimistic about 2016; says still work to do about job growth, criminal justice reform, national security
Obama thanks Congress for ending year 'on a high note' by passing education, transportation and budget measures