Subject: Re: The Coup Underway and Call to Americans
I simply believe The President has a right to designate agents to act on his authority because, and this is obvious, he can't do everything himself face to face with the respective agencies. And if there exists some rule that limits how many agents he can utilize then that would be an unconstitutional restraint on how many simultaneous initiatives he can have underway at any point in time.

This. The President can designate agents.
One such agent is the duly appointed Secretary of State Marco Rubio, who is now the acting director of USAID.