SpaceX CEO Elon Musk lashed out at Secretary of Transportation and acting NASA administrator Sean Duffy Tuesday night, sparking a new feud as the U.S. seeks to win the “ second space race .”

Duffy drew Musk’s ire after telling CNBC that he was reopening SpaceX’s contract to lead a return to the moon, saying Musk’s company was “behind” schedule on building a lunar lander capable of transporting astronauts to its surface.

“They push their timelines out, and we’re in a race against China,” Duffy said of SpaceX during an interview on CNBC’s “ Squawk Box . “The president and I want to get to the moon in this president’s term, so I’m going to open up the contracts.”

Duffy later said NASA would be open to receiving new proposals for lunar landers from SpaceX rivals like Jeff Bezos’ Blu

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