Federal prosecutors investigating Trump's handling of documents have the recording, CNN said.
Trump has previously said all the document he took with him when leaving office were declassified.
Following a new CNN report about an audio recording that suggests former President Donald Trump knowingly took a classified document, legal experts are saying it could be the damning evidence needed to charge him under the Espionage Act.
CNN reported Wednesday that several sources told the outlet about a recording obtained by federal prosecutors in which Trump acknowledged he had taken a classified document that detailed a potential attack on Iran.
The recording included Trump saying he was not sure he was able to declassify records after leaving the presidency, two sources said.
The New York Times and CBS News have also confirmed the existence of the recording.
CNN said had not listened to the recording but was told about it by sources who called it an "important" piece of evidence. »