The Tesla CEO has backed off his criticism of Trump, but he's continuing to feud with a key member of his administration.

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.

After Elon expressed regret for some of the tweets, the White House said Trump was thankful and "appreciative" of his apology — however, it sounds like he's certainly not forgiving or forgetting, as a source tells People the two remain on "so far from good terms."