At a celebratory rally after Trump’s inauguration, Musk’s White House career got off to a contentious start when he seemingly offered a straight-arm salute at the Capitol One Arena in Washington, D.C., as he excitedly told the crowd: “My heart goes out to you.”

Elon Musk's time in the Trump administration is coming to an end after a tempestuous 129 days in which the world's richest man took an axe to government spending - stirring ample controversy along the way.