WASHINGTON (AP) — A House committee is planning to challenge whether an Internal Revenue Service supervisor properly invoked her constitutional right against self-incrimination at a hearing on the agency’s targeting of conservative groups.

Lois Lerner used to oversee the IRS division that targeted groups for additional scrutiny when they applied for tax-exempt status. At a May 22 hearing, she invoked her right not to answer lawmakers’ questions after declaring in an opening statement that she had done nothing wrong.