Former Treasury Secretary and Citibank Chair Bob Rubin was cited by a special congressional panel as someone who should have been the subject of a criminal investigation for activities related to the 2008 subprime mortgage meltdown.

The Financial Crisis Inquiry Commission (FCIC) had told the Justice Department that it should open an investigation of Rubin, Treasury Secretary under President Bill Clinton, for alleged securities fraud perpetrated as a member of Citibank’s board.

Rubin was among nine executives recommended for a criminal probe by the FCIC that were cited in a letter sent Thursday from Sen. Elizabeth Warren (D-Mass.) to Justice Department Inspector General Michael Horowitz.

Warren asked the department auditor this week to look into why zero criminal inquiries were launched as a result of the FCIC recommendations, which were publicly disclosed for the first time earlier this year.

Read on.