The pairing of Donald Trump and Elon Musk, the leader of the richest country in the world with the richest person in the world, seemed a perfect match.
But the last 10 days have seen the pair move from gentle disagreement to bitter acrimony. These are the public moments which brought their relationship crashing down.
Speaking to CBS News, Musk criticises Trump's plans for a new bill on tax and spending - saying the planned legislation left him "disappointed".
Trump later admits to reporters that he is "not happy about certain aspects" of the bill while at the same time being "thrilled" about some aspects, such as tax cuts.
He doesn't comment directly on Musk's remarks, however.
