Why should anyone believe him?

 

According to Donald Trump, everything former SecDef Mark Esper said about him in a new book is false.

I don't know of any reason we should believe anything Trump says.

Trump hit back at Mark Esper's series of damaging claims, saying his former defense chief was so useless he had to 'run the military' himself

"Esper is the latest senior Trump administration official to release a book with damaging revelations about their time in office. Trump has characteristically responded to criticism by former officials by questioning their competence and insulting them."

Do you sense a pattern?  I do.