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Mrs. Collins said the revelations about the nation’s tax agency only contribute to “the profound distrust that the American people have in government. It is absolutely chilling that the IRS was singling out conservative groups for extra review.”

She said she was disappointed that Obama “hasn’t personally condemned this.” The president, Mrs. Collins said, “needs to make crystal clear that this is totally unacceptable.”

Ms. Lerner said that about 300 groups were singled out for additional review, with about one-quarter scrutinized because they had “tea party” or “patriot” somewhere in their applications.

Ms. Lerner said 150 of the cases have been closed and no group had its tax-exempt status revoked, though some withdrew their applications.

Mrs. Collins appeared on CNN’s “State of the Union,” Mr. Rogers was on “Fox News Sunday,” and Mr. Issa spoke on NBC’s “Meet the Press.”