Perry should just tuck in his tail and quit.
Sadly, I think that Perry---in his obsession to damage Trump in any way---has done himself more harm than good in his presidential bid by getting involved in this Trump vs. Mccain squabble, a squabble that many of us will barely remember 6 months from now. He should have stayed out of the squabble or softened his comments.
I make that statement above for this reason: Presidential candidate Perry's out of control comments concerning this Trump vs. Mccain squabble shows me that he does not possess the strong mental and decision-making skills needed to stand up to the terrorist group in Iran without blinking first in any dispute if he were elected president.