Elon Musk is expressing some regret for waving a chainsaw to rile up the crowd during a conservative conference back in February, as his feud with Donald Trump over the president’s tax and spending bill reignites. “Milei gave me the chainsaw backstage and I ran with it, but, in retrospect, it lacked empathy,” Musk said in a post on X, referring to the Argentine President who was on stage with him at the Conservative Political Action Conference.