Yang has denied having any recollection of what happened, or has said that working-level officials engaged in misconduct without his involvement.

But the prosecution is believed to have obtained sufficient evidence to arrest Yang.

Prosecutors are said to have secured a senior judge’s notebook documenting orders from the senior judge’s superiors, as well as orders from Yang, to intervene in trials. Other evidence that could implicate Yang includes a blacklist of judges drawn up by court officials, as well as a document produced by law firm Kim & Chang detailing Yang’s discussions with the firm’s lawyer, who represented South Korean plaintiffs seeking compensation from Japanese companies that forced them into labor before and during World War II.

Yang, who headed the country’s top court from 2011 to September 2017, faces 40 charges including abuse of power, leaking of state secrets and dereliction of duty.

Prosecutors suspect Yang of using trials as bargaining chips to win support from the Park administration to establish a separate court of appeals. He is accused of pressuring judges in charge of politically significant trials to deliver verdicts in the Park administration’s favor and of penalizing judges who opposed Yang’s management of the court.

One of the high-profile cases in which Yang is suspected of interfering involved Koreans forced to work for Japanese companies during Japan’s 1910-45 occupation of the Korean Peninsula. Yang is suspected of having intentionally delayed the deliberation of a lawsuit filed by the victims, mindful of the Park administration’s wishes to mend ties with Japan.

On Yang’s watch, the Supreme Court also allegedly collected inside intelligence from the Constitutional Court to keep it in check, covered up irregularities involving judges and interfered with the trial of Won Sei-hoon, a former spy chief accused of leading an online campaign to help then-presidential candidate Park Geun-hye win the 2012 election.

A decision about the arrest warrant is likely to be made as early as Tuesday.

By Ock Hyun-ju (laeticia.ock@heraldcorp.com)