Earlier in January, Choi slammed the investigation team over alleged attempts to force her into confessing collusion with the president, in violation of democratic norms.
Choi has been refusing to be questioned by the investigators for nearly a month.
Political scandal around the South Korean president broke out in late October 2016, when media reported that Park had allowed her friend Choi, who held no official post, to edit her speeches thus letting the "shadow adviser" influence the country's policy. Moreover, Choi is accused of pressuring big South Korean corporations and extorting money from them for her non-commercial funds.
On December 9, the South Korean parliament voted to impeach the president in the wake of the scandal. The court has six months to decide upon the validity of the impeachment. If it is proved valid, presidential elections will be held within two months.
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