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Ms. Collins said she doesn’t believe the problem is limited to a few rogue IRS employees, noting that groups with “progressive” in their titles weren’t targeted.

“If it had been just a small group of employees, then you would think that the high-level IRS supervisors would have rushed to make this public, fired the employees involved and apologized to the American people and informed Congress,” she told CNN. “None of that happened in a timely way.”

Rep. Darrell E. Issa, California Republican and chairman of the House Oversight and Government Reform Committee, said he isn’t satisfied with the IRS apology and that the agency must undergo reforms to ensure such actions aren’t repeated.

“There has to be accountability for the people who did it,” he said on NBC’s “Meet the Press.” “This mea culpa is not an honest one.”

Sen. Dianne Feinstein, California Democrat, also said she is concerned.

“My understanding is the inspector general is doing a report, that report should be out shortly, and I think we have to take a good look at it,”she said on “Meet the Press.”

The Tea Party Patriots, which calls itself the nation’s largest tea party organization, rejected the IRS apology and demanded the immediate resignations of all of those involved in the “deliberate harassment” of tea party groups.

“We will fight this problem with the IRS and we will win because our freedom depends on our ability to exercise our constitutional rights,” said Jenny Beth Martin, national coordinator for Tea Party Patriots.

This article is based in part on wire service reports.