While we don’t know the substance of what was discussed, Musk’s presence is a concerning preview of Trump’s often reckless approach to diplomacy — as well as his disregard for the line between private interests and public policy. There are a lot of reasons why Musk should be the last person hopping on that call.

President-elect Donald Trump joined Elon Musk in south Texas on Tuesday to watch SpaceX launch a Starship rocket. Though the launch was a success, SpaceX opted not to catch the booster with large mechanical arms as planned.