South Korea's opposition Democratic Party on Monday urged the country's Constitutional Court to swiftly rule on President Yoon Suk Yeol's impeachment, saying keeping the country waiting is "irresponsible" and deepening social division.

Thousands of South Koreans have filled the streets of downtown Seoul in massive rival rallies for and against impeached President Yoon Suk Yeol.

South Korea's opposition party Monday urged the country's Constitutional Court to rule swiftly on suspended President Yoon Suk Yeol's impeachment, saying delays were "irresponsible" and causing social unrest.

Yoon is South Korea’s first president who has been arrested while in office, and there are no clear laws or past rulings that could guarantee his immediate return to office, analysts say. But he was eventually released from prison, after a Seoul court canceled his arrest and allowed him to stand his criminal trial without being detained.

Rival parties clashed Sunday over the U.S. Department of Energy's (DOE) designation of South Korea as a "sensitive country," with the main opposition party blaming impeached President Yoon Suk Yeol's "incompetence.