The leader of South Korea’s ruling party has called for President Yoon Suk Yeol to step down immediately, citing “significant risks” that Yoon could be planning a second attempt to impose martial law on the east Asian country.

Han Dong-hoon, Yoon’s former political protégé and leader of the president’s conservative People Power party, said on Friday that he had received intelligence that Yoon had ordered troops to arrest prominent politicians during his botched attempt to introduce martial law this week.

“I am worried that Yoon could potentially put the Republic of Korea and its citizens in great danger if he is allowed to continue to serve as the president, as he poses a significant risk of extreme actions, like reattempting to impose martial law,” Han said in a televised meeting with high-ranking party officials in parliament.