The IRS on Friday apologized for singling out tea party and other conservative groups.
On Tuesday, the agency said, "After seeing issues with particular cases, inappropriate shortcuts were used to determine which cases may be engaging in political activities. It is important to note that the vast majority of these cases would still have been centralized based on the general criteria used for other cases."
Acting IRS Commissioner Steven Miller is scheduled to testify before the House Ways and Means Committee at a hearing Friday. Miller became acting commissioner in November, after Commissioner Douglas Shulman completed his five-year term. Shulman had been appointed by President George W. Bush.
Associated Press reporter Andrew Miga contributed to this report.
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