South Korean President Park Geun-hye refused to testify on Tuesday in the impeachment trial that will decide her future, prompting the prosecutors to question why she has publicly denied the charges of corruption but will not do so before the court.

After Park's refusal, the Constitutional Court delayed the start of oral arguments and asked her to testify on Thursday, when some of her current and former aides are also scheduled to testify. The court cannot force her to appear but can proceed without her if she refuses twice to appear at the hearings.

Lawmaker 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 said.

Lee Joong-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 must decide within six months of her Dec 9 impeachment whether Park should permanently step down or should be reinstated to office. If the court formally removes Park from office, a presidential election will be held within 60 days.

Park has been accused of colluding with a close confidante to extort money and favors from companies and allowing the friend to manipulate government affairs. Her friend, Choi Soon-sil, Choi's niece, and several former government and presidential officials have been indicted, and a special prosecution team has been investigating bribery suspicions between Park and business giant Samsung.

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

Cho June-hyuck, Seoul's Foreign Ministry spokesman, said that the ministry is preparing for the extradition of Chung, and that her passport will be invalidated if she doesn't hand it in by Monday.

Speaking to reporters in Denmark, Chung said she's willing to return to South Korea if she could continue to be with her 19-month-old-son. She also said Samsung took back a horse and car it had provided her.