Attorneys for former President Donald Trump have been unable to locate the sensitive military document that Trump discussed on tape during a July 2021 meeting at his Bedminster, New Jersey, golf club, sources familiar with the matter tell ABC News.

       Federal investigators have the audio recording, on which Trump acknowledges he held onto a sensitive military document after leaving office, sources previously told ABC News.

       MORE: Investigators have recording of Trump acknowledging he held onto sensitive document: Sources

       On the recording, which ABC News has not listened to nor obtained, Trump is heard attacking Joint Chiefs of Staff General Mark Milley and referencing one document in particular that Trump claimed Milley had compiled, according to sources. Trump, who said on the recording that he still had the document in his possession, said the document was about attacking Iran, sources said.

       Trump's lawyers turned over documents in response to a March subpoena seeking all documents and materials related to Milley and Iran, including any materials containing invasion plans or maps, the sources told ABC News.

       In their dealings with Trump's lawyers, special counsel Jack Smith's investigators said they specifically wanted the document that Trump referenced on the recording, sources familiar with the matter said. But they were unable to locate it.

       Former President Donald Trump greets supporters at a Team Trump volunteer leadership training event held at the Grimes Community Complex, on June 1, 2023, in Grimes, Iowa.

       Scott Olson/Getty Images

       It's also not clear whether Trump had the specific document with him during the July 2021 meeting while he was discussing it. Trump indicated during the recording that he knew the document in question was secret, sources said.

       The special counsel's office declined to comment to ABC News.

       MORE: Fearing indictment is imminent in classified docs probe, Trump team requests meeting with DOJ

       The recording was made during a meeting that Trump held with people who were helping former chief of staff Mark Meadows with his memoir, according to sources.

       Contacted earlier this week about the recording, a Trump spokesperson said in a statement to ABC News, "Leaks from radical partisans behind this political persecution are designed to inflame tensions and continue the media's harassment of President Trump and his supporters."