Former Gatanga MP Peter Kenneth has rejected the Nairobi governor's results saying the nomination was not free and fair.
"I disassociate myself from the sham election that Jubilee Party purported to have and demand the same elections be nullified," he said in a statement on Thursday.
As of Wednesday night, his competitor Mike Sonko was in the lead.
In Langata constituency, Sonko garnered 7,727 against Kenneth who got 2,431. The vote counting is still ongoing with results showing Sonko may be headed to a landslide win.
The two are in the race to unseat Nairobi governor Evans Kidero in August polls.
Kenneth called for a repeat of the nominations adding that Jubilee Party only indicated on the eve of the elections that the voting would be on the basis of an identity card.
The party said they had received reports that there were people who infiltrated Nairobi primaries.
Elections board chairman Andrew Musangi said this was the reason most people could not find their names in the registers.
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