Washington (CNN)Donald Trump's criticism about the Muslim parents of a slain American soldier has generated -- once again -- a backlash within his own party. Just 100 days from the election, Trump has responded in his standard fashion -- dig in, claim he's being treated unfairly and attack back. But the swift condemnation of Trump's response raises questions about whether this controversy is different from the ones that came before it. It certainly isn't going away - Khizr and Ghazala Khan appeared for a lengthy joint interview on CNN's "New Day" on Monday where Khizr accused Trump of "ignorance and...