Elon Musk's virtual interview with Donald Trump today was overshadowed by a technical glitch.

The X (formerly Twitter) owner teased the interview as unscripted and highly entertaining, with no subject limits.

But online traffic overloaded the platform with many struggling to access the live 'space'.

US correspondent Nick Harper says Musk blamed it on a cyber attack, after earlier system scaling tests handled eight million listeners.

"They even suggested through the course of the conversation at one point that potentially the Democrats were behind it - to stop Republican Donald Trump from making it onto the airwaves."

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