Audio of Special Counsel Interview Adds to Renewed Debate of Biden’s Fitness as President

A 2023 audio recording of President Joseph R. Biden Jr. speaking haltingly and having memory lapses is the latest in a series of recent disclosures that have reopened a debate over Mr. Biden’s physical and mental fitness while in office and prompted fresh recriminations among Democrats.

The recording, released by the news outlet Axios on Friday night, documents a four-minute portion of Mr. Biden’s interview with Robert K. Hur, a special counsel who investigated his handling of classified information.

Mr. Hur had concluded early last year that “no criminal charges” were warranted in the case. But in clearing the president, Mr. Hur portrayed Mr. Biden as an “elderly man with a poor memory,” based off an hourslong interview with the president, inflaming concerns that Mr. Biden’s fitness for office had significantly declined.

The audio clip did not reveal new exchanges between Mr. Hur and Mr. Biden. But it gives a fuller picture of why Mr. Hur described Mr. Biden as he did, capturing the president’s whispery voice and the long pauses in his speech. Trump administration officials plan to release the audio, according to two people familiar with the matter, speaking on the condition of anonymity to describe a decision that has yet to be announced.

The audio clip comes as a forthcoming book — written by Jake Tapper of CNN and Alex Thompson of Axios — has provided new details on Mr. Biden’s mental and physical decline and chronicled how Mr. Biden’s advisers stamped out discussion of his age-related limitations. Among other issues, the book recounts Mr. Biden forgetting the names of longtime aides and allies, and outsiders who had not seen the president in some time being shocked at his appearance.

Top Democrats who closed ranks to defend Mr. Biden in his moment of crisis and vouched for his fitness for office have now had to rationalize those statements. In an interview on the “Talk Easy With Sam Fragoso” podcast last month, Senator Elizabeth Warren of Massachusetts — who had urged Mr. Biden to remain in the race to the end — visibly struggled not to laugh when the host asked if the president had at the time been “as sharp as you.”