Nairobi Senator Mike Sonko has raised concern after he found his name missing for the Jubilee Party register.
Sonko an aspiring governor says the clerk at the Bidii Primary polling center had stopped him from voting despite him presenting his ID to the clerk.
He says he was only allowed to vote after the presiding officer intervened on the situation.
Sonko says majority of his supporters have also been locked out in more than 100 pollinng stations he has visited.
Peter Kenneth who voted in Bahati polling station in Makadara constituency also raised concern over the register saying most of his supporters were also locked out.