South Korea’s prime minister and senior presidential officials offered to resign en masse on Thursday, after their conservative ruling party suffered a crushing defeat in parliamentary elections. The results of Wednesday’s elections were a huge political blow to President Yoon Suk Yeol, likely setting back his domestic agenda and leave him facing an intensifying political offensive by his liberal opponents during his remaining three years in office.

Prime Minster Han Duck-soo and all senior presidential advisers to Yoon, except those in charge of security issues, submitted their resignations, according to Yoon’s office. It didn’t immediately say whether Yoon accepted their resignations. Executive power in South Korea is heavily concentrated in the president, but the prime minister is the No. 2 official and leads the country if the president becomes incapacitated.