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Several Republicans, including Wisconsin Congressman Paul Ryan, ripped into IRS Commissioner John Koskinen Friday during a hearing in which the commissioner refused to apologize for the loss of ex-IRS official Lois Lerner’s emails.

A week ago the IRS acknowledged it could not produce some of the emails of the IRS executive at the center of the probe because her computer crashed in 2011, the AP reports. Koskinen acknowledged to lawmakers that the hard drive was recycled and presumably destroyed.

The committee has been probing allegations that the IRS improperly singled out tea party groups seeking tax-exempt status.

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"You told us in May you were going to give us all of Lois Lerner's emails and you learned in February that [the computer] crashed," said Ryan. Koskinen denied that he knew about it in February.

"I have a long career. That's the first time anybody has said that they do not believe me," said Koskinen.

"I don't believe you," Ryan answered.

"That's fine. We can have a disagreement. I'm willing to stand on our record," said Koskinen, denying that the information about the emails was "buried" in the letter.