Republican presidential nominee Donald Trump smiles as he arrives on stage for a press conference with Medal of Honor recipients and veterans during a press conference at the Trump International Hotel, in Washington, DC on September 16, 2016. / AFP PHOTO / MANDEL NGANMANDEL NGAN/AFP/Getty Images

US President Barack Obama speaks to the press as he meets with business, government, and national security, including from L to R, Ohio Governor John Kasich, former New York mayor Michael Bloomberg, Louisiana Governor John Bel Edwards and Atlanta mayor Kasim Reed, to discuss the Trans-Pacific Partnership (TPP) in the Oval Office at the White House in Washington, DC, on September 16, 2016. / AFP PHOTO / NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images

Republican presidential nominee Donald Trump arrives for a press conference at the Trump International Hotel, in Washington, DC on September 16, 2016. / AFP PHOTO / MANDEL NGANMANDEL NGAN/AFP/Getty Images

Republican presidential nominee Donald Trump arrives on stage for a press conference with Medal of Honor recipients and veterans during a press conference at the Trump International Hotel, in Washington, DC on September 16, 2016. / AFP PHOTO / Mandel NganMANDEL NGAN/AFP/Getty Images

U.S. President Barack Obama speaks at the Our Ocean Conference at the State Department in Washington, D.C., U.S., September 15, 2016. REUTERS/Kevin Lamarque

US President Barack Obama speaks to the press as he meets with business, government, and national security to discuss the Trans-Pacific Partnership (TPP) in the Oval Office at the White House in Washington, DC, on September 16, 2016. / AFP PHOTO / NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images

US President Barack Obama speaks to the press as he meets with business, government, and national security, from (L to R), former treasury secretary Henry Paulson, Ginni Rometty, Chairwoman, President and CEO of IBM, Ohio Governor John Kasich, former New York mayor Michael Bloomberg, Obama, Louisiana Governor John Bel Edwards, Atlanta mayor Kasim Reed and former NATO Supreme Allied Commander James Stavridis, to discuss the Trans-Pacific Partnership (TPP) in the Oval Office at the White House in Washington, DC, on September 16, 2016. / AFP PHOTO / NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images

WASHINGTON, DC - SEPTEMBER 16: U.S. President Barack Obama responds to a question about Republican presidential candidate Donald Trump questioning Obama's place of birth during a meeting with business, government, and national security leaders in the Oval Office of the White House September 16, 2016 in Washington, DC. Obama met with the business, government, and national security leaders to discuss the Trans-Pacific Partnership. Also pictured is Ohio Governor John Kasich (L). (Photo by Win McNamee/Getty Images)