Uhuru Kenyatta, Odinga's deputy, beat him by more than 7 percentage points in the March 4 voting, but the men avoided a runoff by only 8,100 votes, the BBC reported.
Odinga's supporters gathered outside the Supreme Court, but were dispersed by police firing tear gas. Authorities had warned the crowd not to assemble.
Kenyatta and his running mate, William Ruto, are facing trial at the International Criminal Court over post-election violence in 2007 that sent the country spiraling into chaos, CNN reported.
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