"We deem that the fresh election ordered by the Supreme Court can not therefore be held", Nasa claimed.
"We have come to the conclusion that there is no intention on the part of the IEBC to undertake any changes to its operations and personnel to ensure that the "illegalities and irregularities" that led to the invalidation of the 8th August 2017 do not happen again".
A Kenyan judge has allowed a minor opposition candidate to run for president, a day after opposition leader Raila Odinga withdrew from the rerun of the poll ordered by the Supreme Court.
Odinga has withdrawn from the October 26 vote, saying the election commission has not made needed changes to avoid the "illegalities" cited in the nullified August vote.
"The Commission can not compel a candidate to participate in an election".
He said the commission had "stonewalled" reforms the opposition had sought and wasted time in "public relations exercises" meant to create an impression of "motion without movement".
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Raila said his withdrawal requires the commission chaired by Wafula Chebukati to conduct fresh nominations as provided for in Elections Act 2011, Section 13 (1).
Mr Odinga had called for countrywide protests to demand reforms to the commission ahead of the new election.
"Following the withdrawal of the NASA presidential candidate, the Commission and the legal team are meeting and will communicate way forward", the post read.
The Supreme Court last month rejected the August election in which Kenyatta was declared the victor after Odinga challenged the results, saying hackers infiltrated the electoral commission's computer system to manipulate the vote. His Jubilee Party has instead used its parliamentary majority to push for changes in the electoral law ahead of the October 26 vote.
"The only election the Jubilee administration is interested in is one that it must win, even unlawfully", Mr Odinga said.
The latest development follows a High court's decision to give Presidential candidate Ekuru Aukot the green light to participate in the repeat election.