Traders work on the floor of the New York Stock Exchange (NYSE) in New York City, U.S., September 15, 2016. REUTERS/Brendan McDermid

Republican presidential nominee Donald Trump appears at a campaign rally in Miami, Florida, U.S., September 16, 2016. REUTERS/Mike Segar

Republican presidential nominee Donald Trump appears at a campaign rally in Miami, Florida, U.S., September 16, 2016. REUTERS/Mike Segar

Traders work on the floor of the New York Stock Exchange (NYSE) in New York City, U.S., September 15, 2016. REUTERS/Brendan McDermid

The new iPhone 7 smartphone is displayed inside an Apple Inc. store in Los Angeles, California, U.S., September 16, 2016. REUTERS/Lucy Nicholson -

Civil defense members hold a demonstration to children during a war safety awareness class in Deraa Governorate, Syria. REUTERS/Alaa Al-Faqir

Members of the civil defense rescue children after what activists said was an air strike by forces loyal to Syria's President Bashar al-Assad in al-Shaar neighborhood of Aleppo. REUTERS/Sultan Kitaz

A civil defence member carries a dead child in a site hit by what activists said were airstrikes carried out by the Russian air force in the rebel-controlled area of Maaret al-Numan town in Idlib province, Syria. At least 70 people died in what activists said where four vacuum bombs dropped by the Russian air force, January 2016. REUTERS/Khalil Ashawi