Governor Mike Sonko denied colluding with election officers to tamper with results.
Dr Evans Kidero said that more than 60 per cent of the Forms 37A used to declare Mr Sonko the winner had anomalies.
Nairobi Governor Mike Sonko has dismissed claims by his predecessor Evans Kidero that the election was rigged in his favour.
In a reply to a petition in court, Mr Sonko said Dr Kidero has made unsubstantiated claims, which are not backed by facts. He maintained that the election was free, fair and transparent and conducted in accordance with the principles, spirit and intention of the Constitution.
The petition was filed by Mr Japheth Muroko and Dr Kidero was enjoined in the case.
Dr Kidero has claimed that more than 60 per cent of the Forms 37A used to declare Mr Sonko the winner contained irregularities. He said some of the forms had multiple anomalies, others had no polling station tallies and others lacked the requisite security features.
These anomalies affected more than 308,918 votes.
Dr Kidero said in 798 of the 1,300 Forms 37A used, some were not signed by the agents and presiding officers, others had varied dates yet they were announced from the same polling station while others were not stamped.