A Limuru parliamentary aspirant Kamau Mugo has petitioned the TNA election board to nullify the nominations. He said the primaries were marred with irregularities.

Kamau said he had written to the board to stop the issuance of certificate to businessman Kiragu Chege. He accused Kiragu of "rigging the election".

Speaking yesterday in Limuru town, Kamau said only the old people were allowed to vote, while thousands of youth were kept away. "The old people were the first to be let in to vote with the claim that they needed to help, but they took most of the day," said Kamau.

"It has come to our attention that the 'help' they old people were receiving was a ploy by Kiragu to rig the elections." Kamau said TNA risked losing credibility and support from the youth, who form the largest voting block.