Manj was elected to the National Assembly of Pakistan in the 2002 Pakistani general election as a candidate of Pakistan People's Party (PPP) from NA-134 Sheikhupura-IV. He received 44,073 votes and defeated Irfan Dogar, a candidate of Pakistan Muslim League (N) (PML(N)).[1]
He later joined the Pakistan People's Party Parliamentarian-Patriots group.[2]
He contested the 2008 Pakistani general election as a candidate of Pakistan Muslim League (Q) (PML(Q)) from NA-134 Sheikhupura-IV, but was unsuccessful. He received 32,928 votes and was defeated by Irfan Dogar, a candidate of PML(N).[3]
He contested the 2013 Pakistani general election as a candidate of PML(Q) from NA-134 Sheikhupura-IV, but was unsuccessful. He received 39,351 votes and was defeated by Irfan Dogar, a candidate of PML(N).[4]
He contested the 2018 Pakistani general election as an independent candidate from NA-121 Sheikhupura-III, but was unsuccessful. He received 29,301 votes and was defeated by Mian Javed Latif, a candidate of PML(N).[5]
He was re-elected to the National Assembly in the 2024 Pakistani general election from NA-116 Sheikhupura-IV as an Independent candidate supported by Pakistan Tehreek-e-Insaf (PTI). He received 135,129 votes while runner-up Irfan Dogar, a candidate of PML(N), received 89,960 votes.[6][7]
