The Constitutional Court, an arbiter in a polarized nation, is about to consider whether Yoon Suk Yeol’s impeachment for declaring martial law was justified.

Hours after South Korea’s impeached President Yoon Suk Yeol was formally arrested, triggering rioting by his supporters, his lawyers said Sunday that he remains defiant in his refusal to answer questions over the probe into his declaration of martial law last month.

Police arrested at least 17 of the attackers. The liberal opposition party accused the president of encouraging the attack.