Yoon's move to impose military rule on Dec. 3 was rescinded barely six hours later but it plunged the country into a constitutional crisis and widespread calls for him to step down for breaking the law.
The beleaguered president survived an initial impeachment attempt a week earlier when his People Power Party (PPP) boycotted the vote, preventing a quorum.
At least seven members of the PPP have since declared their intention to support impeachment on Saturday, nearing the eight PPP votes needed to reach the 200 vote threshold alongside the 192 opposition party lawmakers.
Yoon on Thursday vowed to "fight to the end," blaming the opposition party for paralysing the government and claiming a North Korean hack into the election commission made his party's crushing defeat in an April parliamentary election questionable.
Democratic Party leader Lee called Yoon's remarks "a declaration of war" against the people. "It proved that impeachment is the fastest and the most effect way to end the confusion," he said.
Opposition parties have introduced another impeachment bill and plan to hold a vote at 4 p.m. (0700 GMT) on Saturday.
Lee called on PPP members to "join and vote yes for impeachment," saying "history will remember and record your decision." A vote to impeach Yoon would send the case to the Constitutional Court, which has up to six months to decide whether to remove him from office or reinstate him.
AzVision.az
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