Senator Johnson Muthama has maintained that he will not renege on his decision to quit the Machakos race during the August polls.
He said on Tuesday that he will not take part in the election as long as Governor Alfred Mutua and Wavinya Ndeti are contesting the governor seat.
The legislator, who announced his withdrawal from the Senate competition on Monday, said he walked out in protest against Machakos deputy governor Bernard Kiala's predicament.
Kiala was floored by Ndeti in the repeat Wiper nominations at the county, a situation he blamed on party leader Kalonzo Musyoka.
The legislator said the outcome was unfair to Kiala yet he has supported Wiper since the March 4, 2013, general election.
"If Wavinya and Mutua are the gubernatorial candidates in Machakos, I will not run for senator," he said during an interview with Citizen TV.
The former VP has pleaded with the senator to reconsider his move saying the party still needs him in the race against the incumbent.
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"The nominations in Machakos were a sham. I cannot work with either of them," the legislator said further clarifying that he will not seek a seat in Nairobi.
"One and a half months ago I considered running for a seat in Nairobi but that is not the case as at now."
He added that he will not quit the party adding that Wiper belongs to members who have shares through monthly contributions hence their decisions must be respected.
But Muthama said he will now concentrate on campaigning for NASA flag bearer Raila Odinga so that the opposition forms the next government.
"I am supporting Raila as the Nasa presidential candidate, including his running mate. I will now concentrate on campaigning for Nasa and not necessarily in Ukambani. I can be stationed anywhere," Muthama said.
Raila is facing off with President Uhuru Kenyatta among other 16 candidates sponsored either by various parties or running as independent candidates.
On the issues of the selection of the NASA flag bearer, Muthama conceded that they had differences within the Nasa committee.
"But we concluded the matter and the presidential candidate was unveiled. People should not dwell on who attended the Uhuru Park rally and who did not."