The Corruption Investigation Office is expected to decide in the coming days whether to issue a third summons or ask a court to grant an arrest warrant to compel Yoon to appear for questioning.
He is being investigated by prosecutors as well as a joint team comprising police, defence ministry, and anti-corruption officials, while the Constitutional Court deliberates on the impeachment motion passed by parliament.
If upheld by the court, which is required to deliver its ruling within six months of the impeachment, a by-election must be held within 60 days of the court’s decision.
Former president Park Geun-hye was impeached under similar circumstances, but she was investigated only after the Constitutional Court removed her from power.
South Korea’s opposition said Tuesday it would hold back a decision to impeach acting president Han Duck-soo until later in the week.
The opposition Democratic Party earlier said it would introduce an impeachment motion against Han to protest the interim leader’s refusal to sign into law special Bills to investigate Yoon.
