Three Democrats on the Senate Finance Committee are demanding Treasury Secretary Steven Mnuchin formally recuse himself from any matters before the Pension Benefit Guaranty Corp. related to Sears Holding Co., where he was once a board member. Sens. Bob Menendez, D-N.J., Sherrod Brown, D-Ohio, and Ron Wyden, D-Ore. and the ranking Democrat on the panel, made the demand in a letter to Mnuchin Oct.