▁to ▁health ▁reasons . ▁ ▁In ▁January ▁ 2 0 1 5 , ▁Ch ong - Ar uld oss ▁decided ▁not ▁to ▁re - stand ▁for ▁the ▁position ▁of ▁Secretary - General ▁at ▁the ▁Party ' s ▁Central ▁Executive ▁Committee ▁elections ▁and ▁instead ▁challeng ed ▁the ▁inc umb ent , ▁Sebastian ▁Te o , ▁for ▁the ▁position ▁of ▁President ▁of ▁the ▁Party . ▁However ▁she ▁was ▁un success ful ▁and ▁Te o ▁was ▁re - elect ed ▁as ▁President ▁while ▁Tan ▁Lam ▁S ion g ▁was ▁elected ▁as ▁Secretary - General . ▁ ▁In ▁February ▁ 2 0 1 5 , ▁Ch ong - Ar uld oss ▁res igned ▁from ▁NS P . ▁ ▁Sub sequently , ▁she ▁joined ▁the ▁Singapore ▁People ' s ▁Party ▁in ▁April ▁ 2 0 1 5 . ▁ ▁At ▁the ▁ 2 0 1 5 ▁general ▁election , ▁Ch ong - Ar uld oss ▁again ▁stood ▁in ▁the ▁single - member ▁constitu ency ▁of ▁Mount b atten ▁( this ▁time ▁as ▁an ▁SP P ▁candidate ) ▁and ▁again ▁faced ▁Lim ▁Bi ow ▁Ch uan ▁as ▁the ▁P AP ▁candidate . ▁Ch ong - Ar uld oss ▁took ▁ 5 , 9 9 2 ▁votes ▁( 2 8 . 1 6 %) ▁with ▁Lim ▁taking ▁ 1 5 , 2 9 0 ▁( 7 1 . 8 4 %). ▁ ▁On ▁ 2 3 ▁April ▁ 2 0 1 7 , ▁Ch ong - Ar uld oss ▁was ▁elected ▁to ▁SP P ' s ▁Central ▁Executive ▁Committee ▁where