Republican presidential nominee Donald Trump arrives before the start of the ceremony marking the 15th anniversary of the attacks on the World Trade Center at The National September 11 Memorial and Museum in Lower Manhattan in New York City, U.S. September 11, 2016. REUTERS/Brendan McDermid

Republican presidential nominee Donald Trump arrives before the start of the ceremony marking the 15th anniversary of the attacks on the World Trade Center at The National September 11 Memorial and Museum in Lower Manhattan in New York City, U.S. September 11, 2016. REUTERS/Brendan McDermid

Republican presidential nominee Donald Trump arrives before the start of the ceremony marking the 15th anniversary of the attacks on the World Trade Center at The National September 11 Memorial and Museum in Lower Manhattan in New York City, U.S. September 11, 2016. REUTERS/Brendan McDermid

September 11, 2016 6:24 PM (UTC+8)