An audio recording has been released with new details of a 2021 meeting in which former President Trump discusses possession of classified documents he has not released.

The recording, of an interview Trump gave at his resort in Bedminster, NJ, in July 2021 for people working on the memoirs of his former chief of staff Mark Meadows, is a crucial piece of evidence in Special Counsel Jack Smith’s indictment against Trump for the mishandling classified information. The recording first aired Monday on CNN’s Anderson Cooper 360.

The special counsel indictment alleges that those present at the meeting with Trump, a writer, a publisher and two of Trump’s staffers, were shown classified information about a Pentagon plan of attack against an unspecified foreign country.

These are the papers, Trump said at a point that appears to indicate he was carrying a classified Pentagon document detailing plans to attack Iran. This was done by the military, given to me.

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Trump’s reference to something he says is highly confidential, and his apparent showing of documents to other people during the meeting could undermine his later claims in a Fox News Channel interview that he did not carry any documents.

There was no document. That was a huge amount of paperwork and everything else about Iran and other things, Trump said on Fox. And it may have held up or not, but that wasn’t a document. I didn’t have a document per se, there was nothing to disclose. These were newspaper stories, magazine stories and articles.

Trump pleaded not guilty earlier this month to 37 charges related to the alleged mishandling of classified documents kept at his Mar-a-Lago resort in Palm Beach, Florida.

A spokesman for the Trump campaign said the audio recording “provides context once again that President Trump has done absolutely nothing wrong.