Louis Dejoy. He was nominated by Trump, confirmed by the USPS board of directors, all also appointed by Trump. Turns out he also is a massive stockholder in a company called XPO.
Want to guess what XPO does? They're a subcontractor for the USPS. Dejoy has been diverting a **** ton more work their way and they can't handle it.
Dejoy wins, and you loose.
I don't understand why, but the President of the United States does not have the authority to remove a Postmaster General.