South Korea’s impeached president, Yoon Suk Yeol, was detained in a major law enforcement operation at the presidential compound Wednesday, defiantly insisting the anti-corruption agency didn’t have the authority to investigate his actions but saying he complied to prevent violence.

Yoon, the country’s first sitting president to be apprehended, now faces the prospect of a lengthy prison term over potential rebellion charges.

In a video message recorded shortly before he was escorted to the headquarters of the anti-corruption agency, Yoon lamented the “rule of law has completely collapsed in this country.”

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Yoon had been holed up in the Hannam-dong residence in the capital, Seoul, for weeks while vowing to “fight to the end” the efforts to oust him. He has justified his declaration of martial law Dec. 3 as a legitimate act of governance against an “anti-state” opposition employing its legislative majority to thwart his agenda.

The Corruption Investigation Office for High-Ranking Officials said Yoon was brought into custody about five hours after investigators arrived at the presidential compound and about three hours after they successfully entered the residence, in their second attempt to detain him over his imposition of martial law.

A series of black SUVs, some equipped with sirens, were seen leaving the presidential compound with police escorts. Yoon was later seen stepping out of a vehicle after arriving at the agency’s office in the nearby city of Gwacheon. Following questioning, Yoon was expected to be sent to a detention center in Uiwang, near Seoul.

Yoon could be held in custody for weeks, possibly even months or longer.

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The anti-corruption agency, which is leading a joint investigation with the police and the military over whether Yoon’s martial law declaration amounted to an attempted rebellion, has 48 hours to request a court order for his formal arrest on a charge of attempting a rebellion.

If it fails to do so, Yoon will be released. If Yoon is formally arrested, investigators can extend his detention to 20 days before transferring the case to public prosecutors for indictment.