U.S. Democratic presidential candidate Hillary Clinton leaves after speaking at the Black Women's Agenda Annual Symposium in Washington, U.S., September 16, 2016. REUTERS/Carlos Barria

Model plane builder Otto Dieffenbach III makes his remote control plane resembling Donald Trump release fake money as it flies over the beach next to a similar plane resembling Hillary Clinton in Carlsbad, California. REUTERS/Mike Blake

11-Year-old Millie March wears socks with the image of Republican presidential nominee Donald Trump on them at a Trump campaign event at the Trump International Hotel in Washington, D.C., U.S., September 16, 2016. REUTERS/Mike Segar

U.S. Democratic presidential candidate Hillary Clinton leaves after speaking at the Black Women's Agenda Annual Symposium in Washington, U.S., September 16, 2016. REUTERS/Carlos Barria

Republican presidential nominee Donald Trump delivers remarks at a campaign event at the Trump International Hotel in Washington, D.C., U.S., September 16, 2016. REUTERS/Mike Segar

Republican presidential nominee Donald Trump's campaign plane (L) sits on the same tarmac as Democratic nominee Hillary Clinton's campaign plane (R), at Washington National airport in Washington, U.S., September 16, 2016. REUTERS/Carlos Barria

Republican presidential nominee Donald Trump hugs two Medal of Honor recipients before delivering remarks at a campaign event at the Trump International Hotel in Washington, D.C., U.S., September 16, 2016. REUTERS/Mike Segar

U.S. Democratic presidential candidate Hillary Clinton speaks at the Black Women's Agenda Annual Symposium in Washington, U.S., September 16, 2016. REUTERS/Carlos Barria