Napoles has been accused of illegally detaining a former aide who accused her of stealing huge amounts of government development funds, derisively called pork-barrel funds, in conspiracy with powerful lawmakers. She has denied any wrongdoing but was ordered arrested by authorities, with Aquino announcing a 10 million peso ($227,000) bounty for her capture.
Philippine media reports of her lavish lifestyle, including the alleged ownership of an array of elegant houses and condominiums, have angered many Filipinos in a country where nearly a third of the 97 million people live on a little over a dollar a day and about a tenth have left the country in search of jobs and better opportunities abroad.
Amid an outrage expressed on social media, tens of thousands of Filipinos massed up at Manila's Rizal Park Monday to demand the scrapping of the corruption-tainted development fund and called on Aquino to crack down harder on corruption. Aquino, son of revered pro-democracy champions, rose to power in 2010 with a landslide victory on a promise to fight corruption and poverty.
It was one of the largest rallies seen in the Philippines since the huge protests that hounded Aquino's predecessor Gloria Macapagal Arroyo, who faced allegations of massive corruption. Arroyo has denied any wrongdoing but has been detained in a hospital on corruption and election fraud charges.