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.

The vote intensifies a political crisis as the Constitutional Court meets for its first hearing on suspended President Yoon Suk Yeol's short-lived martial law.

South Korea’s parliament voted to impeach prime minister and acting President Han Duck-soo Friday, less than two weeks after parliament stripped President Yoon Suk Yeol of his powers over his short-lived martial law order that plunged the country into political chaos.