Elon Musk’s hostilities with Sean Duffy reignited Tuesday with the billionaire accusing the Trump administration’s Transport Secretary of “trying to kill NASA” and attacking him with crude comments online. The richest man in the world’s onslaught of criticism comes just a day after Duffy told CNBC that Musk’s rocket company was falling “behind” the administration’s timeline for getting humans back to the moon, and that he would now be opening up the government contract to others, including the