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.

President Donald Trump said he is keeping his red Model S Tesla despite his recent feud with Elon Musk, but it might not stay at the White House, where the electric car has been parked since he bought it.