Attacking the Khans is bad form. It's a new political low to pick a fight with a Gold Star family. Trump refuses to back down, but so many folks - McCain, Ryan etc aren't comfortable with it and have said it's not ok , that Trump should have the sense to have his people quit discussing it, and if not, he should fire them.
This person has caused a great deal of trouble for Trump.'while Trump initially started to attack the family, his co-chair continued the argument and the attack needs to stop. Firing the co-chair is not enough but it is a start, and Trump needs to change his attitude comepletly towards Muslims.
Although Trump himself has made many critical comments concerning Khizr Khan, he has not continued those comments as long as his NY Co-Chair has. Distancing himself from this Co-Chair by firing the individual would potentially boost his numbers in the polls, which would be desperately needed at this point in time.
Continuing to attack a parent of a fallen soldier simply for disagreeing with Trump's views is counterproductive to the Trump campaign and will end up hurting Trump in the long run. Trump should fire his Co-Chair because it would send a strong message to voters that he does not tolerate vindictive attacks that serve no purpose except to hurt others.