Kenyatta won the repeat election in October, but his victory is again being challenged at the Supreme Court by civil society activists and a politician.
"There is no ideal election; there will always be errors in elections, but you can not invalidate an election unless those errors affect the outcome", said the country's attorney general, Githu Muigai.
It was the first time a court in Africa had overturned a presidential election, and it kicked off months of uncertainty in East Africa's economic hub.
On Friday (Nov. 17), at least five people were killed as police dispersed supporters of opposition candidate Raila Odinga, who were welcoming him back from a trip overseas. Kenyatta was declared the victor of that vote, but the results were thrown out by the Supreme Court because of irregularities in the transmission of results.
Maraga had in September annulled an August 8 election due to "irregularities and illegalities", in a historic decision hailed across the globe as an opportunity to deepen Kenyan democracy.
Mwau challenged the validity of the October 26 re-run presidential election, which he argues was held in violation of Supreme Court directions, the Constitution and relevant electoral laws. "This position has not been changed by the court ruling", the statement said.
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Odinga is now asking for global intervention as violent protests continue.
Odinga had called for a "National Resistance Movement" after Kenyatta's victory last month.
Dozens of people have been killed in sporadic clashes since the August vote.
Odinga accused the government of being behind the killings, which followed at least five deaths on Friday as police tried to disperse opposition supporters.
All three, two in Kibera, Nairobi and one in Migori were allegedly shot dead by anti-riot police who were called in to rein in on the chaos.
In downtown Nairobi, Elvis Kinyanjui, a vendor selling socks and watches, said he hoped "next year business will be back to normal".