Lawyer Ahmednasir Abdullahi has dismissed Suna East MP Junet Mohamed as a liar with just under 20 hours before Kibra poll.
Orange Democratic Movement party is embroiled in do or die contest with Jubilee party, with ODM leader Raila Odinga and DP William Ruto trading barbs.
While Mr Odinga supports ODM candidate Imran Okoth, Dr Ruto is pushing for election of former footballer McDonald Mariga of Jubilee party.
Last week, Junet said the DP was in talks with a top NASA affiliate party for a possible withdrawal of candidate from the by-election in favour of Mariga.
"The DP is negotiating with one of the NASA affiliate parties to step down their candidate For Mariga . The amount demanded is huge and hence the negotiations taking a bit long.. we shall update Kenyans when the deal is done. Transactional advisor," he claimed.
But until now, no party has withdrawn from the race. DP Ruto campaigned for Mariga on Sunday. ANC candidate Eliud Owalo and Ramadhan Khamisi of Ford Kenya have also stayed put in the race.
On Wednesday, Ahmednasir took a swipe at Mr Mohamed, who doubles as ODM Director of Elections, accusing him of lying to the public about Ruto's plans.
"So this was a LIE...Hon @JunetMohamed ....just the usual lies from ODM...on the eve of election no one has withdrawn," wrote the Senior Counsel.
While Odinga is reportedly using the race to cement new partnerships with like minded parties, Ruto wants to show that he can campaign anywhere.
The DP is keen to enter Nairobi politics ahead of 2022 duel. Mr Odinga has featured in City politics since 1992 when he was first elected as Lang'ata MP.