Former IRS official Lois Lerner invoked the Fifth Amendment again Wednesday morning, refusing to testify before a House hearing held to review IRS targeting of conservative groups.

Lerner, who oversaw tax-exempt organizations at the IRS, had already asserted her Fifth Amendment right against self-incrimination at a hearing in May after the scandal broke.

She was criticized, however, for making an opening statement in which she defended herself before taking the Fifth when questions began.

Rep. Darrell Issa (R-CA), chairman of the House Oversight and Government Reform Committee, adjourned today's hearing after Lerner refused to testify.

Watch his brief exchange with Lerner in the video above.

VIDEO: Sparks Fly Between Cummings and Issa at IRS Hearing

Issa met reporters after the hearing, explaining that Lerner's attorney had told him that Lerner might answer questions "under certain conditions." He adjourned the hearing and left after ranking Democrat Elijah Cummings (MD) began to speak and criticize Issa's investigation of the IRS scandal.

Issa defended his decision to cut off Cummings, saying he was not asking a question and was "slandering" him in his statement.

A reporter challenged him on whether his probe of the IRS targeting is a "political play."

"Not a shred of it. Not a smidgen of it!" he responded, arguing that President Obama expressed outrage over the targeting of conservative groups when the scandal emerged.

Issa said his investigation will continue, even though Lerner will likely never testify voluntarily.

Watch his remarks below, and to hear more from Issa, watch On the Record, tonight at 7p/2a ET.