Elon Musk has a new nickname for Transportation Secretary Sean Duffy: “Sean Dummy.” The childish name-calling, a cornerstone of President Donald Trump’s political style, does not appear to have landed quite as firmly as “Crooked Hillary,

Musk responded with personal insults after Sean Duffy announced plans to seek proposals from Blue Origin and Lockheed Martin for the Artemis mission.

Elon Musk went off on X this week after President Donald Trump’s Transportation Secretary, and interim NASA head, Sean Duffy took a public swipe at SpaceX. Duffy told CNBC on Monday that Musk’s company was falling “behind” on the administration’s timeline to get Americans back to the moon.

Social media posts are not rocket fuel, but if they were, Elon Musk would be on the moon today. Over the summer, Musk famously got into an online feud with President Donald Trump about everything from Trump’s Big Beautiful Bill, to Musk’s threats to form a new political party, to the Jeffrey Epstein files.

The awards highlight the company’s continued dominance over Pentagon space contracts, despite Musk and U.S. President Donald Trump’s public falling out earlier this year.

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.

In an appearance at the Italian Tech Week earlier this month, Bezos expressed his optimism when asked about humans living in space. "I believe we’ll have, you know, in the next kind of couple of decades,