Republican presidential nominee Donald Trump walks away from the podium after stating that he believes U.S. President Barack Obama was born in the United States 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 waves as she boards her campaign plane in Washington, U.S., September 16, 2016. REUTERS/Carlos Barria

Republican presidential nominee Donald Trump walks throughthe atrium of his new Trump International Hotel in Washington, D.C., U.S., September 16, 2016. REUTERS/Mike Segar

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 Barri4

Republican presidential nominee Donald Trump walks with former New York City Mayor Rudolph Giuliani (L) and his son Eric Trumo (R) through the new Trump International Hotel in Washington, D.C., U.S., September 16, 2016. REUTERS/Mike Segar

Republican presidential nominee Donald Trump reacts as reporters yell questions to him after he stated that he believes U.S. President Barack Obama was born in the United States 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 states that he believes U.S. President Barack Obama was born in the United States at a campaign event at the Trump International Hotel in Washington, D.C., U.S., September 16, 2016. REUTERS/Mike Segar