SEOUL—South Korea’s legislature voted to impeach acting President Han Duck-soo on Friday after he declined to make judicial appointments needed to advance the impeachment of his predecessor, extending the political upheaval that began with a short-lived martial law declaration earlier this month.

South Korea's lawmakers on Friday voted to impeach acting President Han Duck-soo, in the second head-of-state ousting this month after a short-lived martial decree on Dec. 3. Han's predecessor, President Yoon Suk Yeol,

South Korea's opposition-controlled National Assembly voted to impeach acting President Han Duck-soo despite vehement protests by governing party lawmakers, further deepening the country's political crisis.