South Korean prosecutors say they've asked a court to issue an arrest warrant for former President Park Geun-hye. If the court does issue a warrant, Park could become the third president to be arrested for criminal allegations after Roh Tae Woo and Chun Doo Hwan, according to Yonhap news agency.
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She and Choi have denied wrongdoing.
Prosecutors accuse Ms Park of conspiring with Choi and a top presidential adviser to pressure 16 business groups, including Samsung, to donate 77.4 billion won (£55 million) to two non-profit organisations that Choi controlled and used for personal profit. Park has denied all 13 charges against her, even though many of her alleged accomplices have either been arrested or jailed for their suspected involvement in the scandal that led to her impeachment.
Choi Soon-Sil, Park's secret confidante at the heart of the scandal, is already on trial for forcing top local firms to "donate" almost $70 million to non-profit foundations which she allegedly used for personal gain.
Prosecutors also believe the money Samsung gave Choi could qualify as bribes provided to Park. She apologized for putting trust in Choi, but said she only let her edit some of her presidential speeches and provide the president with some "public relations" help.
Park was removed from office on March 10 after South Korea's Constitutional Court upheld a decision to impeach her over allegations of corruption and cronyism.
The allegations plunged the country into political turmoil, with both Park's opponents and supporters staging massive street rallies.
Three of Ms Park's supporters, mostly elderly conservative citizens, died during clashes with the police after the March 10 court ruling.
Prosecutors said they requested the warrant for Park based on the severity of the charges against her. and because there is a risk she could destroy evidence.
Several associates of Ms Park are already on trial for their role in the scandal that brought down the nation's first female president.
Choi is suspected of receiving government documents with state secrets from one of Park's former secretaries to meddle in state affairs behind the scenes.