NAIROBI: Kenyan opposition figure Raila Odinga said Tuesday he’ll challenge the results of the close presidential election with “all constitutional and legal options” after Deputy President William Ruto was declared the winner, bringing new uncertainty to a country where the vote was widely considered to be its most peaceful.

Now East Africa’s most stable democracy faces weeks of disputes and the possibility that the Supreme Court will order a fresh election. Religious and other leaders have pleaded for calm in a country with a history of deadly post-election violence.

“Let no one take the law into their own hands,” Odinga said to his often passionate supporters. In Kisumu, a city in his western Kenya stronghold, some residents said they were tired of going into the street and being tear-gassed.

This was Odinga’s first appearance since Kenya’s electoral commission chairman on Monday declared Ruto the winner with almost 50.5 percent of the votes. Four of the seven commissioners abruptly announced they couldn’t support the results, and Odinga supporters scuffled with the remaining commissioners at the declaration venue.

Shortly before Odinga spoke, the four commissioners asserted to journalists that the chairman’s final math added up to 100.01 percent and the excess votes would have made a “significant difference.” They also said he didn’t give them a chance to discuss the results before his declaration.

“What we saw yesterday was a travesty and blatant disregard of the constitution,” Odinga said, calling the election results “null and void.”

The 77-year-old Odinga has pursued the presidency for a quarter-century. His campaign has seven days after Monday’s declaration to file a petition with the Supreme Court, which would then have 14 days to make a ruling.

Odinga is renowned as a fighter, detained for years in the 1980s over his push for multiparty democracy, and a supporter of Kenya’s groundbreaking 2010 constitution. His claim that the deeply troubled 2007 election was stolen from him led to violence that left more than 1,000 dead. Though he boycotted the fresh 2017 vote, his court challenge led to election reforms.

The electoral commission had been widely seen as improving its transparency in this election, practically inviting Kenyans to do the tallying themselves by posting online the more than 46,000 results forms from around the country.

On Tuesday, the local Elections Observation Group announced that its highly regarded parallel voting tally “corroborates the official results” in an important check on the process.

But Odinga asserted that only the electoral commission chairman could see the final results before the declaration. “The law does not vest in the chairperson the powers of a dictator,” he said, and insisted that decisions by the commission must be taken by consensus.

There was no immediate statement from the electoral commission or its chairman. A screen at its tallying center that had been showing cumulative presidential election results stopped being updated Saturday and was later turned off. The official form showing final results could not be accessed on the commission’s website Tuesday.

Odinga’s campaign had expected victory after outgoing President Uhuru Kenyatta in a political twist backed his former rival Odinga instead of his own deputy president, with whom he fell out years ago. Some Kenyans have noted that Kenyatta appointed the four dissenting commissioners last year.

The 55-year-old president-elect, Ruto, appealed to Kenyans by making the election about economic differences and not the ethnic ones that have long marked the country’s politics with sometimes deadly results. He portrayed himself as an outsider from humble beginnings defying the political dynasties of Kenyatta and Odinga, whose fathers were Kenya’s first president and vice president.