The Security Council has the power to order a one-year deferral, but whether it would is another question. It has never before deferred a case. Ghebreyesus said if it is not granted, the group will ask for a postponement of Kenyatta's trial, and if that is not granted then African leaders have decided Kenyatta should not appear before the court, he said.
The decision at the close of a one-day heads of state summit was unanimous, said Ethiopian Prime Minister Hailemariam Desalegn. Both Kenyatta and Sudan President Omar al-Bashir also wanted by the war crimes tribunal were in attendance.
Kenyatta, 51, has been in office since April. He is from the Kikuyu ethnic group and is accused of having financed and helped organize the Mungiki, a militia-like organization that was implicated in the worst atrocities against other ethnicities in the wake of the 2007 poll.
The call for a deferral to the case "is nothing more than another attempt to derail and delay justice for Kenya's victims and betrays the AU's purported commitment to fight impunity," said Davis Malombe, deputy executive director of Kenya Human Rights Commission.
The declaration comes as the lawyers appointed to defend Kenyatta at the Netherlands-based tribunal submitted new evidence to the court, claiming that they have recordings proving witnesses testifying against Kenyatta had switched from being defense witnesses "for money."
Counsel Steven Kay, who heads the defense team, also says they have evidence the written statements of five prosecution witnesses were in fact created by a single person.
He called on the court to "permanently halt the proceedings on the basis of an abuse of process as a fair trial is no longer possible."
Kenya's Deputy President William Ruto and broadcaster Joshua Sang also have been charged with crimes against humanity. Their trials, which began last month, continued Friday.
Arriving in the Ethiopian capital before the meeting Kenyatta delivered a fiery speech, portraying the ICC as a vestige of imperialism:
"Even though we were dominated and controlled by imperialists and colonial interests in years gone by, we are now proud, independent and sovereign nations," he said. "More than ever, our destiny is in our hands. Yet at the same time, more than ever, it is imperative for us to be vigilant against the persistent machinations of outsiders who desire to control that destiny."
He went on to thank the African Union for backing him: "As Kenya's President, it gives me a feeling of deep and lasting pride to know that I can count on the African Union to listen and help in trying times. Africa has always stood by our side."
Kenya's parliament last month voted to withdraw from the ICC. The African Union special summit being held this weekend was convened at Kenya's request.
Before the summit political insiders in Kenya's government said that African countries may decide to sever ties with the ICC in solidarity with Kenya.
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Michael Corder contributed to this report from the Hague, Netherlands.