If it was recorded on a radio mic, has it not already been "broadcast" to any unknown number of listeners as it happened? It was probably just the one device capturing the audio, but might have been several.
Sounds like the recording is already widely distributed and the angle here is preventing mass publishing anyway, so maybe that's not significant.
... Why do we allow politicians to get away with "I don't recall" so often? I wouldn't believe that reply from my four year old son if it happened as often.