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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/Getty Images)

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/Getty Images)

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Sixty-eight year-old Ali S. Ali of Canton, Michigan stops to have his shoes shined during the 53rd annual convention of the Islamic Society of North America in Rosemont, Illinois on September 3, 2016. Ali says he has attended the convention nearly 50 times. / AFP / VNEWS International LLC (Photo credit should read VNEWS INTERNATIONAL LLC/AFP/Getty Images)

Sixty-eight year-old Ali S. Ali of Canton, Michigan stops to have his shoes shined during the 53rd annual convention of the Islamic Society of North America in Rosemont, Illinois on September 3, 2016. 

Ali says he has attended the convention nearly 50 times. / AFP / VNEWS International LLC        (Photo credit should read VNEWS INTERNATIONAL LLC/AFP/Getty Images)

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A Muslim-American woman attends a voter registration workshop during the 53rd annual convention of the Islamic Society of North America on September 3, 2016 in Rosemont, Illinois. The group is working to turn out Muslim voters at a time when their religion is central to the American presidential political debate. / AFP / derek henkle (Photo credit should read DEREK HENKLE/AFP/Getty Images)

A Muslim-American woman attends a voter registration workshop during the 53rd annual convention of the Islamic Society of North America on September 3, 2016 in Rosemont, Illinois. 
The group is working to turn out Muslim voters at a time when their religion is central to the American presidential political debate. / AFP / derek henkle        (Photo credit should read DEREK HENKLE/AFP/Getty Images)

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A Muslim-American woman walks past a solo protester outside the 53rd annual convention of the Islamic Society of North America, September 3, 2016 in Rosemont, Illinois. Kelly Harris (L) traveled from Greenbay, Wisconsin, he says to 'witness' during the convention, billed as the largest assembly of Muslims in the US and Canada. / AFP / derek henkle (Photo credit should read DEREK HENKLE/AFP/Getty Images)

A Muslim-American woman walks past a solo protester outside the 53rd annual convention of the Islamic Society of North America, September 3, 2016 in Rosemont, Illinois. 
Kelly Harris (L) traveled from Greenbay, Wisconsin, he says to 'witness' during the convention, billed as the largest assembly of Muslims in the US and Canada.  / AFP / derek henkle        (Photo credit should read DEREK HENKLE/AFP/Getty Images)

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Khizr (L) and Ghazala Khan (R), 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/Getty Images)

Khizr (L) and Ghazala Khan (R), 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/Getty Images)