A billionaire’s vendetta has threatened to cut off the US from the ISS and complicate national defense

After a year of effusive praise and expressions of love for each other, Elon Musk and Donald Trump exploded their political partnership in dramatic fashion this week. The highly public split included, among other highlights, the world’s richest person accusing the president of the United States of associating with a notorious sex offender. Trump said Musk had “lost his mind”.

As Musk and Trump traded insults, each on his own social network, they also issued threats with tangible consequences. Trump suggested that he could cancel all of Musk’s government contracts and subsidies – “the best way to save money”, he posted – a move that would have devastating consequences not only on the tech billionaire’s companies but also on the federal agencies that have come to depend on them. Musk responded by announcing that he would begin decommissioning the SpaceX Dragon spacecraft that Nasa relies on for transport missions, although he later reversed the decision.