Last year alone, companies owned by Elon Musk were promised $3 billion across nearly 100 different government contracts with 17 federal agencies.

Trump warns his former ally against backing any Democratic candidates to challenge the Republicans, as a messy feud between the two escalates.

As Elon Musk and President Donald Trump traded jabs on their rival social media platforms, their feud has escalated beyond a public spat, threatening billions of dollars in federal contracts and throwing the future of America's space program into question.