Seoul. South Korea’s governing party chief expressed support Friday for suspending the constitutional powers of President Yoon Suk Yeol for imposing martial law this week, in a bombshell reversal that makes Yoon’s impeachment more likely.

Opposition parties are pushing for a parliamentary vote on Yoon’s impeachment on Saturday, calling his short-lived martial law declaration an “unconstitutional, illegal rebellion or coup.” But they need support from some members of the president’s People Power Party to get the two-thirds majority required to pass the impeachment motion.

The turmoil resulting from Yoon’s nighttime martial law decree has frozen South Korean politics and caused worry among neighbors, including fellow democracy Japan, and Seoul’s top ally, the United States, as one of the strongest democracies in Asia faces a political crisis that could unseat its leader.

During a party meeting, PPP leader Han Dong-hun stressed the need to suspend Yoon’s presidential duties and power swiftly, saying he poses a “significant risk of extreme actions, like reattempting to impose martial law, which could potentially put the Republic of Korea and its citizens in great danger.”

Han said he had received intelligence that Yoon had ordered the country’s defense counterintelligence commander to arrest and detain unspecified key politicians based on accusations of “anti-state activities” during the brief period martial law was in force.

“It’s my judgment that an immediate suspension of President Yoon Suk Yeol’s official duties is necessary to protect the Republic of Korea and its people,” Han said.

Impeaching Yoon would require support from 200 of the National Assembly’s 300 members. The opposition parties who jointly brought the impeachment motion have 192 seats combined. PPP has 108 lawmakers.

If Yoon is impeached, he would be suspended until the Constitutional Court rules on whether to remove him from office or restore his presidential power. Prime Minister Han Duck-soo, the country’s No. 2 official, would take over presidential responsibilities.

The Defense Ministry said it suspended from duty the defense counterintelligence commander, Yeo In-hyung, who Han alleged had received orders from Yoon to detain the politicians. The ministry also suspended Lee Jin-woo, commander of the Capital Defense Command, and Kwak Jong-geun, commander of the Special Warfare Command, over their involvement in enforcing martial law.

In a closed-door briefing to lawmakers, Hong Jang-won, first deputy director of South Korea’s National Intelligence Service, said Yoon called after imposing martial law and ordered him to help the defense counterintelligence unit to detain key politicians. The targeted politicians included Han, opposition leader Lee Jae-myung and National Assembly speaker Woo Won Shik, said Kim Byung-kee, one of the lawmakers who attended the meeting. Kim said Hong told lawmakers he ignored Yoon’s orders.

The spy agency’s director, Cho Taeyong, questioned Hong’s account. Cho told reporters that such an order would have come to him, rather than Hong, and that he never received any orders from Yoon to detain politicians.