South Korea's main opposition party plans to "immediately" take steps to impeach acting president Han Duck-soo, the party's floor leader said on Tuesday. The Democratic Party's (DP) floor leader Park Chan-dae announced this after Han postponed approving legislation to launch a special counsel investigation into President Yoon Suk Yeol's failed bid to impose martial law. Prime Minister Han has taken over from the suspended Yoon, who was impeached on Dec. 14 and faces a Constitutional Court review on whether to oust him or restore his powers.