The Independent Electoral and Boundaries Commission has barred Wavinya Ndeti from vying for Machakos governor seat.
The electoral agency said it found that her Wiper nomination was irregular. Ndeti has been fighting to retain her nomination certificate after a petition was filed challenging her eligibility.
Some members of the Wiper party sought to block her nomination, arguing that she was still a member of Chama Cha Uzalendo (CCU).
The petitioners claimed that Ndeti belongs to two parties and is, therefore, not eligible to be on the ballot as this contravenes the law and the Constitution.
During the Wiper nomination exercise, Ndeti beat her closest rival Bernard Kiala with over 200,000 votes, results which Kiala contested.
Kiala has since decamped from Wiper and is seeking election as an independent candidate.