(CNN) - The controversy over the extra scrutiny the Internal Revenue Service imposed on some conservative groups seeking tax-exempt status could take a new turn Wednesday when IRS official Lois Lerner is expected to assert her Fifth Amendment right against self-incrimination at a House Oversight Committee hearing.
Lerner's decision essentially not to testify will follow a Senate Finance Committee hearing Tuesday where former IRS Commissioner Douglas Shulman and ousted Acting Commissioner Eric Miller both testified.