Because it's his nature to be combative and bombastic. Go back and review the dust-up between he and rosie o'doughnuts - he couldn't let it go. Sure, trading a barb or two is OK but knowing when to move on is essential. The Donald doesn't know when to move on.
> “The Donald doesn’t know ***when*** to move on. “
Oh he knows ***when*** to move on. It’s just that his idea of ***when*** doesn’t match your idea of ***when***.
Evidently, Trump DOES know when to move on...He told Tapper he hoped the next interview would be with serious, relevant questions...It’s the media who refuse to move on...
“he couldn’t let it go.”
Versus the entire Bush family who let every slight go, and then gave Hillary a medal.
He has ten billion that says you're wrong.