Khizr (R) and Ghazala Khan (L), parents of a slain US soldier who ended up in a war of words with Republican presidential nominee Donald Trump, speak at the Islamic Society of North America's annual convention, billed as the largest assembly of Muslims in the US and Canada, on September 3, 2016 in Rosemont, Illinois. / AFP / derek henkle (Photo credit should read DEREK HENKLE/AFP via Getty Images)