Elon Musk has built his reputation as a man who never backs down—a tech gladiator convinced he’s always right. When he responds to criticism, it’s usually to mock it. The word sorry doesn’t live in his vocabulary. Or at least, it didn’t. For the first time, the billionaire Tesla CEO engaged in an unprecedented act of humility.

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."