Donald Trump is denying reports he had a habit of pretending to be his own PR man back in the 1990s.

A tape has surfaced of a man sounding very much like Trump, talking about Trump, but using the name John Miller.

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Trump has previously admitted using the alias John Miller, but says it was a joke.

As Sky's Hannah Thomas-Peters reported, the emergence of the recording is a gift to his opponents.

"It's certainly ammunition for Hillary Clinton come general election. Will it affect him right now in the middle of a primary battle where he's got plenty of loyal voters? Probably not, but stuff like this really could hurt him come November."