Elon Musk lashed out at Transportation Secretary Sean Duffy in a series of insulting posts on his social media platform X on Tuesday, after Duffy suggested NASA may sideline SpaceX from its moon mission.

Musk, SpaceX’s CEO, called Duffy “Sean Dummy,” accused him of having a “2 digit IQ” and posted sophomoric memes aimed at Duffy.

“Should someone whose biggest claim to fame is climbing trees be running America’s space program?” Musk asked in a post Tuesday morning, which he pinned to his X profile. (Duffy, a former member of Congress, is a world champion lumberjack speed climber.)

On Monday, Duffy said in an interview with CNBC that he believes SpaceX, which has a $2.9 billion contract to provide the lunar lander astronauts would ride to the moon’s surface, is lagging behind schedu

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