Some fireworks on Capitol Hill this morning as furious Republicans are calling out IRS Commissioner John Koskinen. Lawmakers are outraged after learning a week ago that many of former IRS official Lois Lerner's emails from a two-year period supposedly have disappeared.

New claims have surfaced that Lerner's hard drive was destroyed and emails from several other officials also have gone missing. Koskinen got the hearing off to a contentious start (video below) by telling House Ways and Means Committee Chairman Dave Camp (R-MI) that he doesn't feel an apology is owed for the lost emails.

Camp had challenged Koskinen about why he did not apologize in his opening statement.

Later, Rep. Paul Ryan (R-WI) went off on Koskinen, telling him simply "nobody believes you." He called out Koskinen for "burying" the disclosure about Lerner's lost emails in a 27-page letter to the Senate.

"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.

Afterward, Steve Hayes told Bill Hemmer he had never seen Ryan get that angry. Watch the exchange above.