The US president and the tech billionaire have a wide range of means to target each other, and a further escalation of their spat could be devastating for both

Musk's Dragon capsule is currently the only way that Trump can send American astronauts and supplies to the International Space Station. Musk threatened to decommission SpaceX's Dragon spacecraft 'immediately', but u-turned five hours later after one of his followers told him to 'cool off', tweeting: "Good advice. Ok, we won’t decommission Dragon."