Google search results this morning says there are three presidents, including him. He is using his twitter account to give presidential orders and decrees.

https://twitter.com/richardgrenell

Richard Grenell @RichardGrenell 18m I hereby order multiple desalinization plants to be built in California. And I also hereby order new Nuclear power plants to be built in California. Oh, and Eric Swalwell hereby loses his security clearance.

And this:

Richard Grenell @RichardGrenell 23m I hereby order an LNG terminal to be built ASAP on the West Coast of the United States (preferably in California).