TOPSHOT - People listen as Democratic presidential nominee Hillary Clinton speaks during the Congressional Hispanic Caucus Gala September 15, 2016 in Washington. Hillary Clinton returned Thursday to the campaign fray in a tightening race against Republican Donald Trump, who released new details of his physical fitness in response to the health scare that sidelined his rival. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images

TOPSHOT - Democratic presidential nominee Hillary Clinton pauses while speaking during the Congressional Hispanic Caucus Gala September 15, 2016 in Washington. Hillary Clinton returned Thursday to the campaign fray in a tightening race against Republican Donald Trump, who released new details of his physical fitness in response to the health scare that sidelined his rival. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images

TOPSHOT - Democratic presidential nominee Hillary Clinton speaks during the Congressional Hispanic Caucus Gala September 15, 2016 in Washington. Hillary Clinton returned Thursday to the campaign fray in a tightening race against Republican Donald Trump, who released new details of his physical fitness in response to the health scare that sidelined his rival. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images

TOPSHOT - Democratic presidential nominee Hillary Clinton arrives at The National Airport in Washington on September 15, 2016. Hillary Clinton returned Thursday to the campaign fray in a tightening race against Republican Donald Trump, who released new details of his physical fitness in response to the health scare that sidelined his rival. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images

WASHINGTON, DC - SEPTEMBER 15: Guests watch U.S. President Barack Obama speaks on a big screen during the 39th annual awards gala of the Congressional Hispanic Caucus Institute (CHCI) September 15, 2016 in Washington, DC. The gala is one of the nationÕs premier events commemorating Hispanic Heritage Month. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - SEPTEMBER 15: Guests watch U.S. President Barack Obama speaks on a big screen during the 39th annual awards gala of the Congressional Hispanic Caucus Institute (CHCI) September 15, 2016 in Washington, DC. The gala is one of the nationÕs premier events commemorating Hispanic Heritage Month. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - SEPTEMBER 15: U.S. President Barack Obama waves after he spoke during the 39th annual awards gala of the Congressional Hispanic Caucus Institute (CHCI) September 15, 2016 in Washington, DC. The gala is one of the nationÕs premier events commemorating Hispanic Heritage Month. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - SEPTEMBER 15: U.S. President Barack Obama speaks during the 39th annual awards gala of the Congressional Hispanic Caucus Institute (CHCI) September 15, 2016 in Washington, DC. The gala is one of the nationÕs premier events commemorating Hispanic Heritage Month. (Photo by Alex Wong/Getty Images)