The lawmaker has been a member of the parliament of Nyeri Town since 2017.
He is the vice chairman for the Education and Research Committee and a member of the security committee.
Ngunjiri is a one of the DP's fierce critics and prides himself as one of the individuals who started the kieleweke agenda, which he stated was a call to stop early campaigns. Kieleweke is a group allied to President Uhuru Kenyatta and ODM leader Raila Odinga.