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Republicans said they weren’t satisfied with Mr. Miller’s apology and explanations.

“I’m sad and I’m sick to my atom that Americans could be targeted for their political believes,” said Rep. Lynn Jenkins, Kansas Republican.

Rep. Tom Price, Georgia Republican, said called the IRS’s action “chilling” and “very very serious.”

But Rep. Earl Blumenauer, Oregon Democrat, said lawmakers are partially to blame for the problem because Congress has “slowly been starving” the IRS budget and expanded the tax code while their caseload has ballooned. This, coupled with an expanded tax code, invites for agents to make dangerous shortcuts, he said.

“I really hope that there is an opportunity to support the integrity of the Internal Revenue Service,” he said.

I “hope that we look at the task they’ve been given, the budget they’ve been given and think a little bit about a rate of return that would more than pay for itself if we invested in training, in management and having more than 150 to deal with the avalanche of these applications.”

The inspector general’s audit, released Tuesday, singled out conservative groups for “burdensome” scrutiny because of their politically charged names and delayed approving some applications for so long that the groups simply gave up.

The independent watchdog recommended the IRS make nine major reforms aimed at speeding up but also clarifying the agency’s approval process for tax-exemption — two of which the IRS initially rejected.

But on Friday, Mr. Miller suggested the House committee his agency would implement all of the recommendations.

“There’s no air between us on the recommendations,” he said.