The man is uneducated, almost illiterate, unlearned, ill mannered, rude, a product of having a rich father and no more success than that, and worse, is not "educatable" because he can't and won't recognize his mistakes, let alone learn from them.  He is the ultimate in "some people you can't tell anything to unless they already know it"...he is ill prepared to be a janitor let alone President, and Commander in Chief of the world's most sophisticated military...he is not fit to be a boy scout leader let alone Commander.