US President Donald Trump has threatened to cancel Elon Musk's government contracts after a very public falling-out on social media. Trump said he was "very disappointed" and "very surprised" with Musk's attacks against his signature spending bill. The massive package, which passed the Republican-led House of Representatives by a single vote in May and has been dubbed by Trump as his "one, big beautiful bill", was slammed by Musk in a number of social media posts because it's estimated to increase the federal deficit by trillions of dollars. Sherwin Bryce-Pease has this story. Sakina Kamwenso spoke to John Stremlau, the International Relations expert and Professor of International Relations at Wits University.