Makadara Member of Parliament George Aladwa is now blaming Orange Democratic Movement (ODM) party leader Raila Odinga for the party's loss in the concluded Embakasi South parliamentary by-election.
This comes hours after ODM candidate in the race Irshad Sumra lost to Wiper party's Julius Mawathe.
Aladwa is now heaping blame on Raila for failing to keep the former MP off the race to avoid the humiliation.
He faulted the former Prime Minister for failing to reach out to Wiper boss Kalonzo Musyoka on how to best deal with the issue, and ensure that only one of the two candidates vies for the seat.
This, he said, is with the consideration that both parties are members of the opposition's National Super Alliance (NASA).
He noted that it would have been better for Raila to seek another slot or appointment for Sumra and let Mawathe complete his term, long before Sumra moved to court and successfully petitioned Mawathe's 2017 election.
"Katika masuala ya Embakasi ni Raila alituangusha. Muda huu wote angeutumia kumtafuta Kalonzo ili waelewane Mawathe aendelee na kazi naye Sumra atafutiwe pahali. (Raila failed us. He would have approached Kalonzo and agreed on allowing Mawathe to complete his term and allocate a different position to Sumra)," he said.
The lawmaker who doubles up as the ODM party chairman in Nairobi County was speaking on Radio Jambo's Mazungumzo Waziwazi show on Saturday morning.
He said that the presence of the two candidates in the ballot also contributed to confusion among voters, most of whom watched both of them push for Raila's presidency in 2017.
Consequently, he added, some ended up voting in the wrong direction, a situation he said would have been avoided if the alliance fronted a single candidate to battle the others.
He added that Sumra's loss also had something to do with his background, considering that most Kenyans still vote on tribal lines, yet he is an Indian in a Kamba and Kisii dominated area.
"Candidate wetu japo ni Mkenya sio mmoja kati ya zile jamii ambazo ziko kwa wingi katika eneo hili (though he is Kenyan, our candidate lacked the tribal support in the race)," he added.
Sumra has since conceded defeat.