Nairobi, Kenya (CNN) -- Lawyers for Kenyan Prime Minister Raila Odinga filed a petition Saturday to challenge election results that declared him the runner-up in the presidential election.
His supporters gathered outside the supreme court in the capital of Nairobi as his lawyers filed the petition.
His deputy prime minister, Uhuru Kenyatta, who ran against him, clinched 50.07% of the vote to Odinga's 43.31%, according to the election commission.
Odinga has rejected the results of the March 4 election, saying they are flawed.
Kenyatta, the son of the nation's founding father, is facing trial at the International Criminal Court over post-election violence that plunged the nation into chaos in 2007.