The spokesman for Afghanistan's president says that the nation's two presidential candidates are set to sign a power-sharing deal nearly three months after a disputed runoff vote.

Presidential spokesman Aimal Faizi said Sunday that Ashraf Ghani Ahmadzai and Abdullah Abullah were set to sign a deal on the national unity government at noon local time (0730 GMT).

The deal, agreed to in talks that began late Saturday, follows weeks of negotiations on a power-sharing arrangement following accusations of fraud in the June runoff vote.

The deal would be a victory for U.S. Secretary of State John Kerry, who first got the candidates to agree in principle to share power during a July visit to Afghanistan.