NASA ’s acting Administrator Sean Duffy seems to have provoked the ire of Elon Musk.

Musk, the founder and CEO of SpaceX, took aim at Duffy on Tuesday in a flurry of social media posts, attacking his intelligence and recent efforts at the helm of the space agency.

“Sean Dummy is trying to kill NASA!” Musk wrote on X , which he also owns, using an insulting nickname to refer to the acting administrator. In a separate post, he said : “The person responsible for America’s space program can’t have a 2 digit IQ.”

Musk’s posts came after Duffy announced on Monday that in NASA’s quest to return astronauts to the moon — and to do so before China puts its own bootprints there — the agency is open to using moon landers from competitors to SpaceX.

NASA’s plan had been to use SpaceX’s next

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