The tribunal chair person Faith Waikwa says the decision was reached after a thorough scrutiny of the nomination exercise.
Joyce Wanjiku Ngugi, who came second in the nominations had filed a complaint to the five-member tribunal citing irregularities during the exercise.
If elected, Kuria will become President Uhuru Kenyatta’s Member of Parliament after the position was left vacant following the death of Joseph Ngugi.
Kuria has already been awarded with the TNA certificate to vie for the position.
READ Moses Kuria gets TNA nod in Gatundu South
The political activist, who is known to vigorously defend the government in newspaper commentaries and social media, is facing hate speech charges over a Facebook post.
Kuria, who spoke to journalists on June 24 after receiving the certificate, said he is optimistic of getting elected and vowed to continue defending the Jubilee administration.
“I am confident that I am going to win this seat and not because Gatundu South is a TNA zone but because when I talked to the people when I campaigned, they sent a message which sank into my heart,” he stated.
“They want leadership which is close to them… I sampled challenges they are facing but amazingly they may appear complicated but the solutions are simple.”
“I will galvanize the people; I will not say I am the superman who is going to have all the solutions in my hand.”
He said he will serve the people of Gatundu South diligently not only as President Uhuru Kenyatta’s Member of Parliament but also, “as a young person of Kenya who wants to see the country develop to great heights.”
“A lot of time people assume they are elected to be the bosses of those people… but I will work to ensure we are all together in this,” he stated.
He said the constituency was already on the growth mode, “and I will continue on that route until the area is fully developed.”