An intense public feud erupted on Thursday between President Donald Trump and his one-time ally, billionaire Elon Musk, with an argument about Trump’s massive tax and domestic policy bill raging across social media and in the Oval Office.

Over the course of their now-rocky relationship, Elon Musk and Donald Trump shared a number of notable memes, media moments and photo ops together. They amplified one another on social media and appeared side-by-side at campaign events,