He added that Cummings "has demonstrated that we have seen yet again some cherry-picking when it comes to the release of testimony, release of information," Carney added, referring to past instances when Republicans on the Oversight panel made public details on other issues that turned out to be incomplete or misleading.
The inspector general report last month found that an IRS unit in Cincinnati had used criteria that included conservative labels such as "tea party" to target groups seeking tax-exempt status for extra questioning. IRS rules prevent groups engaging in political activity from becoming tax exempt.
According to the report, the targeting began in 2010 and ended last year when senior IRS officials learned of it. It blamed a misguided effort to streamline handling of increased applications for tax-exempt status, exacerbated by unclear regulations regarding what constitutes political activity.
Republicans contend the targeting was political discrimination in the run-up to the 2012 election, and one of the GOP-led House committees heard from groups who detailed delayed handling of their requests, excessive questioning by the IRS for inappropriate information, and other problems.
Some conservatives also contend they faced IRS tax audits due to political targeting, but no evidence of such activity has turned up in investigations so far.
George told an earlier congressional hearing that his unit was investigating the possible use of other lists of criteria to trigger additional scrutiny of tax-exempt applications. He provided no details.
Meanwhile, the partisan bickering goes on.
The Republican National Committee released a video this week that accused the Obama administration of dodging responsibility. It included footage of IRS officials testifying before congressional committees, edited to highlight when they said they didn't know or were unable to remember details.
"Americans deserve answers to why their First Amendment rights were so egregiously violated," RNC Chairman Reince Priebus said. "Turning a blind eye and claiming not to know, or remember, what actions were carried out is no excuse for targeting individuals based on their beliefs. These are simple questions, and if they can't answer it raises another: what are they hiding?"