Elon Musk has attacked NASA's administrator - and claimed he isn't smart enough to hold the top job.

The billionaire's criticism of Sean Duffy came after the space agency said it was open to using moon landers that weren't manufactured by his company SpaceX.

On X, Musk accused Mr Duffy of "trying to kill NASA", and wrote: "The person responsible for America's space program can't have a 2 digit IQ."

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Lift-off for SpaceX's Starship!

While NASA has been planning to use SpaceX's Starship rocket system to land on the lunar surface, proposals will now be accepted from rivals.

The agency wants to return astronauts to the moon within Donald Trump's second term and do so before China gets there.

Mr Duffy had told CNBC: "We'

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