Emails obtained by Fox News reveal that former IRS official Lois Lerner warned colleagues to be cautious about what they say in emails.

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Rep. Darrell Issa, R-Calif., referred to that discussion during a House oversight committee hearing on Wednesday, as he once again pressed IRS Commissioner John Koskinen on his concerns about ex-official Lois Lerner's missing emails.

He specifically voiced concern about an internal IRS chat system called the Office Communications Server, claiming Lerner wanted to make sure the messages weren't tracked.

This system was the subject of the emails between Lerner and other staffers in April 2013.

On April 9, 2013, Lerner, the director of Exempt Organization at the IRS, sent an email to IT employee Maria Hooke, asking about the OCS and whether Congress could access those messages.

"I was cautioning folks about email and how we have had several occasions where Congress has asked for emails and there has been an electronic search for responsive emails -- so we need to be cautious about what we say in emails," Lerner wrote.

She forwarded a question about whether the chat system conversations were also searchable.

Hooke responded that the messages "are not set to automatically save" but anyone could "copy and save the contents" to an email or file.

She recommended that the agency treat these conversations "as if it could/is being saved [somewhere], as it is possible for either party of the conversation to retain the information and have it turn up as part of the electronic search."

Lerner replied: "Perfect."

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J. Christian Adams, PJ Media legal editor, was on “The Kelly File” tonight to discuss the new revelation.

“It gets more absurd by the day, this IRS abuse scandal,” he said.

Adams said that the IRS allows its records to vanish into thin air and noted that there seems to be no accountability.

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“She doesn’t want people to know what was on those instant messages for a reason. Most Americans have enough common sense to know what that reason is. This is an agency that was so abusive it chilled political speech during the 2012 election,” he said.

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