Nigeria's main opposition party on Saturday named former vice president Atiku Abubakar as its candidate for the 2023 election to replace President Muhammadu Buhari.
Abubakar, 75, a northern Muslim and stalwart of the People's Democratic Party or PDP, has made numerous bids to capture the presidency of Africa's most populous country.
He won most ballots from PDP party delegates who voted in a primary election in Abuja on Saturday, beating a challenge from Rivers State Governor Ezenwo Nyesom Wike.
"Today we are making another history, history which we believe will bring about fundamental changes," Abubakar told supporters in a national arena in Abuja where the primary took place.
"PDP, PDP, power to the people."
The PDP and Buhari's ruling All Progressives Congress party (APC) were both scheduled this weekend to select candidates for the presidential race in February.
But a day before its primaries were to start, the APC announced that it had pushed its party convention back a week to June 6 through June 8.
Earlier on Saturday, PDP delegates and political leaders packed out an Abuja national arena, decked out in the opposition party's red, white and green colours.
Buhari, 79, leaves office with Nigeria still struggling to end a more than decade-long jihadist conflict in its northeast and a wave of violent banditry and mass kidnapping in its northwest.
Africa's largest economy is also still recovering from the impact of the coronavirus pandemic and fallout from the Ukraine war that has pushed up fuel and food prices across the continent.
The PDP ruled Nigeria for a decade and a half before its then-president Goodluck Jonathan was ousted by the APC alliance in 2015 to bring Buhari to power.
- APC wrangling -
The APC said the delaying of its own primaries decision followed a ruling by electoral authorities to extend the deadline for the submission of candidates' names.
The APC gave no further details, but the ruling party has been caught in fierce wrangling over who should run, with former Lagos governor Bola Tinubu and current Vice President Yemi Osinbajo among the possibles.
Buhari has not endorsed any candidate to succeed him and some analysts expect him to attempt to find a consensus nominee to keep the APC's factions together ahead of the February 2023 presidential and parliamentary elections.
An alliance of smaller parties drawn together for Buhari's 2015 election win, the APC has often struggled to contain internal divisions.
"It clearly means the APC is going the consensus route, which requires more backroom dealing than the usual primaries," SBM Intelligence analyst Tunde Ajileye said of the ruling party delay.
"It also means the consensus candidate is one that many are not accepting easily."
Local media has been discussing a possible return by former president Jonathan as an APC candidate after a group of supporters bought him a nomination form. Jonathan himself denied any part in the move.
Under an informal agreement among the political elite, Nigeria's presidency is usually alternately "zoned" between candidates from the north and the south.
After eight years under northerner Buhari, many agree the presidency should now go to a candidate from the south.
Rotating power at the national government level has been seen as a balancing force in a country almost equally divided between the mostly Christian south and predominantly Muslim north.
Most top PDP candidates like Abubakar were from the north though the Rivers State governor Wike is from the south.
Most APC top candidates, including Tinubu and Osinbajo, are also from the south of Nigeria. Former president Jonathan is a southerner.
Since its return to civilian rule from a military dictatorship in 1999, Nigeria has held six national elections, which were often marred by fraud, technical difficulties, violence and legal challenges.
In 2019, when Buhari was re-elected, the Independent National Electoral Commission was criticised for delaying the initial vote by a week. Abubakar, who lost to Buhari, challenged the results in court.