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.

If Noem is confirmed by the Senate, she will be in charge of immigration enforcement agencies, including U.S. Customs and Border Patrol and U.S. Immigration and Customs Enforcement.