Donald Trump’s spat with Elon Musk could throw the U.S. space program into turmoil. After the president threatened to terminate government contracts for SpaceX, Musk clapped back by saying he would immediately begin “decommissioning” the NASA-used Dragon spacecraft, seemingly removing it from service. NASA relies on SpaceX’s Dragon craft to get astronauts to and from the International Space Station. Musk would later walk back his statement, saying that wouldn’t happen.

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