Republican lawmakers on the House Oversight and Government Reform Committee are pressing Attorney General Eric Holder Jr. for details about whether former IRS official Lois Lerner waived her right against self-incrimination when she spoke to investigators.

Rep. Darrell Issa, R-Calif., the committee chairman, and Rep. Jim Jordan, R-Ohio, sent a letter to Holder on Thursday asking for information about Lerner, the former Internal Revenue Service director of exempt organizations who has refused to testify on Capitol Hill.