South Korean president refuses to testify

South Korean President Park Geun-hye has refused to testify in a case that will decide her future following her impeachment over a corruption scandal, forcing the Constitutional Court to delay the start of oral arguments.

After Park's refusal, the nine-justice court asked her to testify on Thursday, when some of her current and former aides are also scheduled to testify. Her no-show brought criticism from MPs, who serve as prosecutors in the trial.

The court has said it cannot force Park to appear in the hearings, which under law can proceed without her if she refuses for a second time to appear.

Politician Kweon Seong Dong, the chief prosecutor in the trial, questioned why Park cannot defend herself in court when just two days ago she vehemently rejected the accusations of corruption in a hastily arranged meeting with reporters at Seoul's presidential Blue House.

"It's not good etiquette to the justices and also inappropriate for the president, as the defendant of the impeachment trial, to say this and that to the media outside of court," Kweon told reporters.

Lee Jung-hwan, Park's lawyer, said she does not plan to appear on Thursday and will probably not testify during the impeachment trial.

The trial in the Constitutional Court will decide if Park should permanently step down or be reinstated. If the court formally removes Park from office, a presidential election will be held within 60 days.

South Korea's opposition-controlled parliament voted last month to impeach Park, weeks after state prosecutors accused her of colluding with a close confidante to extort money and favours from companies and allow the friend to manipulate government affairs.

After indicting Park's friend, Choi Soon-sil, Choi's niece, and several former government and presidential officials for allegedly helping Choi, state prosecutors handed over the investigation to a special prosecution team, which has been focusing on proving bribery suspicions between Park and business giant Samsung.

The investigators want to bring home Choi's daughter, Yoora Chung, who was arrested in Denmark, as they look into the suspicions that Samsung sponsored Choi in exchange for government favours.