“The committee uncovered new information indicating that after groups provided the information to the IRS, nearly one in 10 donors were subject to audit,” Rep. Charles W. Boustany Jr., Louisiana Republican and chairman of the Ways and Means Committee’s oversight panel, told IRS Commissioner John Koskinen at a hearing Wednesday.

“The abuse of discretion and audit selection must be identified and stopped,” he said.

Mr. Koskinen didn’t specifically address the accusations during the hearing, and the IRS didn’t respond to a request for comment late Wednesday evening.

The revelation was made on the same day that the House voted on a nonbinding resolution asking the Justice Department to appoint a special prosecutor to investigate the IRS targeting.