JPMorgan Chase chief executive Jamie Dimon is set to answer questions under oath on Friday about his knowledge of Jeffrey Epstein’s crimes, as the legal reckoning over the bank’s decision to retain the late sex offender as a client reaches Wall Street’s highest echelons.

The sworn testimony, which the US’s largest lender had tried to prevent from happening, marks a significant escalation in two high-profile cases over JPMorgan’s 15-year relationship with Epstein, which has embarrassed some current and former executives and shone an unflattering light on the bank’s internal compliance processes. The deposition will take place behind closed doors and is set to last up to two days.

Dimon’s name has already come up in the contentious litigation, which was brought by an unnamed Epstein accuser and the US Virgin Islands, on which Epstein had a home, towards the end of last year.