WASHINGTON — SpaceX Chief Executive Elon Musk hurled insults at NASA’s acting administrator a day after complaints that the company was behind schedule on its Artemis lunar lander.

In a series of social media posts Oct. 21, Musk questioned the qualifications and intelligence of Sean Duffy, who also serves as secretary of transportation.

“Sean Dummy is trying to kill NASA!” Musk wrote in one post responding to reports that Duffy was interested in folding the space agency into the Department of Transportation in some way.

That was one of Musk’s milder comments. In another post, he shared a poll asking, “Should someone whose biggest claim to fame is climbing trees be running America’s space program?” — a reference to Duffy’s early career as a lumberjack.

Musk’s attacks came a day afte

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