In an interview with NBC News, the president also said he assumes his relationship with the tech billionaire is over after their recent falling-out.

Elon Musk's father Errol has called his son's feud with President Donald Trump a "mistake," saying the pair "have been under incredible stress for five months." Why It Matters The world has watched the dramatic fallout between Trump,

Donald Trump and Elon Musk exchanged back-and-forth insults online after a disagreement over the president's spending bill. Here's a complete timeline of Donald Trump and Elon Musk's friendship, including why they are now feuding.