It began with Musk complaining about the centerpiece of Trump’s legislative agenda, which the president at first took in stride. Eventually Trump let slip that he was disappointed in his former adviser, prompting Musk to unleash a flood of insults and taunts.

A knock-down fight between world's the richest person and the most powerful politician is playing out in public view.

Amid the very public feud unfolding Thursday between Elon Musk and President Donald Trump, the world’s richest man dropped what he claimed was a “really big bomb” — that the president appears in disgraced financier Jeffrey Epstein’s unreleased criminal files.