Arnold Punaro, a retired Marine Corps general with extensive experience preparing nominees for Senate confirmation, said he did not expect the appointment to present any legal issues because Miller was already confirmed by the Senate before being sworn in for his previous job in August.

Read more: https://www.washingtonpost.com/national-security/defense-secretary-mark-esper-fired-trump/2020/11/09/9b7cbcbc-a5b9-11ea-8681-7d471bf20207_story.html