South Korea’s jailed ex-President Yoon Suk Yeol again refused to attend questioning by investigators Friday, using a new method to resist: He took off his prison uniform and lay down on the floor at his detention room.

South Korea’s impeached former president Yoon Suk Yeol lay on his prison cell floor in his underwear to resist attempts to interrogate him, prosecutors said Friday. Prosecutors obtained a fresh arrest warrant on Thursday to forcibly bring the former leader in for questioning over allegations of election tampering.

Officials said Yoon Suk Yeol took off his prison uniform and laid down on the floor at his detention room in an effort to continue to resist questioning.