NAIROBI, Kenya (AP) — Kenya's leading opposition candidate has debated moderators after incumbent President Uhuru Kenyatta turned down an invitation to the presidential debate.

Recent polls show Raila Odinga closing the popularity gap to within four percentage points of Kenyatta. Local media outlets that organized the debate Monday said the president declined to participate in the debate. Kenyatta is increasingly under fire over runaway corruption, insecurity and health, among other issues.

It's Odinga's fourth attempt to become president. He unsuccessfully petitioned the Supreme Court to challenge Kenyatta's 2013 win, claiming the system was set up to allow more easily manipulated manual tallying and voting. Kenyatta received a majority of votes to avoid a runoff with Odinga, but he did so by only 4,099 votes out of more than 12.3 million cast.