Why should he have to take the supposed high road?  Trump started this with his nonsense and abrasive nature:

"...“He’s not a war hero,” said Trump. “He was a war hero because he was captured. I like people who weren’t captured.”..."

Who the heck is Trump to talk?  I can't defend a draft dodger....no matter the war.  I joined and honorably served even though I knew the wars we've had since WWII are largely unjust.  But, I served just the same as a way of thanking this country for the Constitution and the freedoms it gives us.  All Trump did was avoid serving with all of his effort.  Friggin' coward!