FILE - In this Thursday, July 28, 2016 file photo, Khizr Khan, father of fallen US Army Capt. Humayun S. M. Khan and his wife Ghazala speak during the final day of the Democratic National Convention in Philadelphia. Republican presidential nominee Donald Trump broke a major American political and societal taboo over the weekend when he engaged in an emotionally-charged feud with Khizr and Ghazala Khan, the bereaved parents of a decorated Muslim Army captain killed by a suicide bomber in Iraq. He further stoked outrage by implying Ghazala Khan did not speak while standing alongside her husband at last week's Democratic convention because they are Muslim. (AP Photo/J. Scott Applewhite, File)