SEOUL, South Korea — 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.

Yoon, removed from office in April over his ill-fated imposition of martial law, was sent back to prison last month as he stands a high-stakes trial over rebellion and other charges. Yoon, a conservative, faces investigations into other criminal allegations that are not related to his Dec. 3 martial law decree but target him, his wife and others.

On Friday, Min Joong-ki, a special counsel named by his liberal rival and new President Lee Jae Myung, sent investigators to retrieve Yoon from a detention center near Seoul after the former preside

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