Elon Musk called the transportation secretary ‘Sean Dummy’ on X Tuesday, after Duffy suggested NASA may sideline SpaceX from its moon mission.

Sean Duffy, the Secretary of Transportation and acting administrator of NASA, appeared on CNBC on Monday to say that SpaceX had fallen behind in its effort to return Americans to the moon with the Artemis program. And SpaceX CEO Elon Musk was not happy about it.

The SpaceX boss posted a series of posts on X in response to remarks made by Sean Duffy about the timeline for getting humans back to the moon

Elon Musk criticizes government plan to merge NASA with DOT, calling it a threat to agency's independence and U.S. space leadership. Supports Jared Isaacman for leadership.

Elon Musk's SpaceX has settled a lawsuit filed by the maker of the popular party game Cards Against Humanity over accusations that the space technology company damaged land the card company owns in Te

The SpaceX CEO took shots at Transportation Secretary Sean Duffy as Duffy and Jared Isaacman position themselves to lead the space agency.

SpaceX has launched the 10,000th Starlink into orbit after successfully delivering another batch of 56 satellites on Sunday. The milestone means that SpaceX boss Elon Musk now controls two thirds of all active satellites, according to data from non-profit satellite tracker Celestrak.

SpaceX signed the nearly $3 billion government contract in 2021. It helped solidify the fledgling company as a powerhouse in space travel as the country with the most advanced space program gave it the stamp of approval. Since then, SpaceX’s valuation has ballooned from $100 billion to reports of over $400 billion.