National Super Alliance (NASA) presidential candidate Raila Odinga has withdrawn from the repeat presidential election slated for October 26.
Mr Odinga said his withdrawal would give the electoral commission enough time to introduce reforms that will help deliver a more credible election.
Addressing a press conference on Tuesday evening, Raila said it is only through his withdrawal from the showdown that the country will have a credible, free and fair election as per the law.
The Supreme Court annulled the result of the original 8 August poll after finding irregularities and declaring it "neither transparent or verifiable".
The electoral commission had declared incumbent Uhuru Kenyatta the winner.
It said Mr Kenyatta had won by a margin of 1.4 million votes.
The re-run was due to take place on 26 October, but Mr Odinga said: "After deliberating on our position in respect of the upcoming election, considering the interests of the people of Kenya, the region and the world at large, we believe that all will be best served by the party vacating its presidential candidature in the election scheduled for 26 October 2017."
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