Philippine boxing superstar Manny Pacquiao has launched his presidential bid with vows to tackle poverty and corruption as he seeks to win over voters with his rags-to-riches story.

"The time is now -- we are ready to rise to the challenge of leadership," Pacquiao -- currently a senator -- said Sunday, as he accepted the nomination of a rival faction in President Rodrigo Duterte's ruling party.

Pacquiao's star power in a country famed for its celebrity-obsessed politics will put him in a strong position in the presidential race
Pacquiao's star power in a country famed for its celebrity-obsessed politics will put him in a strong position in the presidential race AFP / Patrick T. FALLON

The eight-division world champion and national hero made the announcement weeks after losing what could be his last professional fight, against Cuban Yordenis Ugas in Las Vegas.

Pacquiao, who entered politics in 2010 as a congressman before being elected to the Senate, has long been expected to make a tilt for the country's highest office.

Pacquiao entered politics in 2010 as a congressman, before being elected to the Senate
Manny Pacquiao has confirmed his 2022 presidential run. AFP / Ted ALJIBE

The 42-year-old is deeply admired by many in the archipelago nation for his generosity after hauling himself out of poverty to become one of the world's greatest and wealthiest boxers.

But his support for Duterte's deadly drug war, and previous comments describing gay couples as "worse than animals", have earned the high school drop-out plenty of detractors.

"For those asking what are my qualifications, have you ever experienced hunger?" Pacquiao asked the national assembly held by the anti-Duterte faction of PDP-Laban.

President Rodrigo Duterte, who rivals Pacquiao in the affections of many Filipinos, declared last month he would run for the vice-presidency
President Rodrigo Duterte, who rivals Pacquiao in the affections of many Filipinos, declared last month he would run for the vice-presidency AFP / Noel CELIS

"Have you ever experienced having nothing to eat, to borrow money from your neighbours or to wait for leftovers at a food stall? The Manny Pacquiao that is in front of you was moulded by poverty."

Pacquiao's star power in a country famed for its celebrity-obsessed politics will put him in a strong position in the 2022 presidential race.

PDP-Laban Party

But it will not guarantee victory.

Reaction to his announcement has been mixed, with some questioning the boxer's suitability for the presidency.

'The time is now,' Pacquiao said as he accepted the nomination from his faction
'The time is now,' Pacquiao said as he accepted the nomination from his faction Office of Philippine Senator Koko Pimentel / -

"Seriously, Manny? You're an inspiration in boxing but I can't compromise to let you run my country," said one Twitter user.

A public skirmish between Pacquiao and Duterte over the latter's handling of the South China Sea dispute with Beijing and official graft could also erode support for the boxer.

Duterte -- who is constitutionally allowed to serve only one term as president -- rivals Pacquiao in the affections of many Filipinos and declared last month he would run for the vice presidency.

Pacquiao made the announcement weeks after losing what could be his last professional fight, against Yordenis Ugas
Pacquiao made the announcement weeks after losing what could be his last professional fight, against Yordenis Ugas GETTY IMAGES NORTH AMERICA / Ethan Miller

A party faction loyal to Duterte also endorsed the president's close aide, Senator Christopher Lawrence "Bong" Go, for the top job -- but he has so far declined the nomination.

"I wish them good luck," said Alfonso Cusi, energy secretary and head of the pro-Duterte faction, in response to Pacquiao's announcement.

Pacquiao would face a formidable opponent if Duterte's daughter, Sara Duterte-Carpio, were to run for president, which she is tipped to do.

A recent poll showed the Davao city mayor -- who belongs to a different party than her father -- with the most voter support, well ahead of Pacquiao and other potential contenders.

The deadline for registering as a candidate for next year's elections is October 8.

The nomination of two candidates for president from PDP-Laban showed "how deep the divisions in the ruling party are", said Eurasia Group analyst Peter Mumford.

"A key watchpoint will be whether most of the anti-Duterte camp falls in behind Pacquiao or whether it splits with multiple different presidential candidates," Mumford said.

"The former would complicate Duterte's succession plans by making victory for the eventual Duterte-backed candidate less assured."

Pacquiao, a devout evangelical Christian, was a high-profile backer of Duterte and his controversial anti-narcotics campaign.

International Criminal Court judges last week authorised a full-blown investigation into that policy over the alleged unlawful killing of possibly tens of thousands of people.

Asked if he would protect the current president from criminal charges if he became leader, he said: "All of us are bound to the law."