South Korean police have begun investigating President Yoon Suk Yeol for alleged “insurrection” over his declaration of martial law, a senior police officer has said. On Thursday, Woo Jong-soo, head of the National Investigation Headquarters of the National Police Agency, told lawmakers that “the case has been assigned,” footage showed. South Korean President Yoon Suk Yeol was still clinging to power, with his party announcing they will oppose an impeachment motion after his short-lived imposition of martial law stunned the world.