Last weekend, an attempt by opposition lawmakers to impeach the president failed after members of his own ruling People Power Party (PPP) boycotted the vote. But opposition members are set to hold another impeachment vote this weekend and have vowed to hold one every Saturday until Yoon is removed from office.

The floor leader of the PPP, Choo Kyung-ho, stepped down after the failed impeachment attempt, and on Thursday the party elected Kwon Seong-dong, a Yoon loyalist, as his replacement.

Kwon told reporters on Thursday that he would hold discussions with PPP lawmakers on whether they should continue opposing Yoon’s impeachment.

Yoon’s party had been hoping to convince the President to leave office early, rather than force him out.

Minutes before Yoon spoke, his party leader, Han Dong-hoon, appeared on television saying it had become clear that the president was not going to step aside. Han then urged members of the party to vote to remove him from office this Saturday.

If South Korea’s parliament passes an impeachment bill, a trial would be held by a constitutional court. Two-thirds of that court would have to sustain the majority for Yoon to be removed from office permanently.

Yoon has been a lame duck president since the opposition won the April general election by a landslide – his government has not been able to pass the laws it wanted and has been reduced to vetoing bills proposed by the opposition.

Yoon also accused North Korea sympathisers of trying to undermine his government when he declared martial law last 3 December.

The announcement plunged the country into political turmoil. Protesters faced off against security forces in front of the National Assembly building while lawmakers scrambled to vote down Yoon’s order.

Yoon withdrew his martial law order hours after it was blocked by lawmakers.

Since then, the country has remained on edge. There have been huge protests and strikes calling for Yoon’s impeachment, and the presidential office was raided on Wednesday as Yoon faces multiple investigations on charges of insurrection and treason.

Meanwhile, ex-defence minister Kim Yong-hyun, who resigned and took responsibility for martial law, attempted suicide while in detention on Tuesday. He is in stable condition.