After the head of the main opposition party narrowly avoided arrest, the party was thrown into disarray.

After their leader, Lee Jae-myung, barely escaped arrest in Monday's National Assembly vote, the major opposition Democratic Party of Korea (DPK) is plagued by factional strife. Prosecutors requested his arrest on accusations of corruption and bribery, and some members of his own party voted to grant the request.

On Tuesday, the DPK's top officials issued a call to action urging party members to work together. Those who voted....