The country’s anti-corruption agency said Tuesday it is investigating whether the declaration amounted to rebellion.

The arrest warrant for an incumbent president is unprecedented, and deepens the political crisis that has engulfed South Korea.

South Korea's suspended president, Yoon Suk Yeol, has for the third time in a row failed to heed a summons to appear before the country's law enforcement authorities, the Yonhap news agency reported on Sunday.