WHITE PLAINS, NY - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton speaks to members of the traveling press aboard her campaign plane at Westchester County Airport on September 15, 2016 in White Plains, New York. Hillary Clinton is beginning to campaign again after taking three days off the trail to recover from pneumonia. Clinton will campaign in North Carolina and Washington D.C. (Photo by Justin Sullivan/Getty Images)

WHITE PLAINS, NY - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton walks back to speak to members of the traveling press aboard her campaign plane at Westchester County Airport on September 15, 2016 in White Plains, New York. Hillary Clinton is beginning to campaign again after taking three days off the trail to recover from pneumonia. Clinton will campaign in North Carolina and Washington D.C. (Photo by Justin Sullivan/Getty Images)

WHITE PLAINS, NY - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton boards her campaign plane at Westchester County Airport on September 15, 2016 in White Plains, New York. Hillary Clinton is beginning to campaign again after taking three days off the trail to recover from pneumonia. Clinton will campaign in North Carolina and Washington D.C. (Photo by Justin Sullivan/Getty Images)

WHITE PLAINS, NY - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton speaks to members of the traveling press aboard her campaign plane at Westchester County Airport on September 15, 2016 in White Plains, New York. Hillary Clinton is beginning to campaign again after taking three days off the trail to recover from pneumonia. Clinton will campaign in North Carolina and Washington D.C. (Photo by Justin Sullivan/Getty Images)

WHITE PLAINS, NY - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton prepares to board her campaign plane at Westchester County Airport on September 15, 2016 in White Plains, New York. Hillary Clinton is beginning to campaign again after taking three days off the trail to recover from pneumonia. Clinton will campaign in North Carolina and Washington D.C. (Photo by Justin Sullivan/Getty Images)

WHITE PLAINS, NY - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton prepares to board her campaign plane at Westchester County Airport on September 15, 2016 in White Plains, New York. Hillary Clinton is beginning to campaign again after taking three days off the trail to recover from pneumonia. Clinton will campaign in North Carolina and Washington D.C. (Photo by Justin Sullivan/Getty Images)

WHITE PLAINS, NY - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton speaks to members of the traveling press aboard her campaign plane at Westchester County Airport on September 15, 2016 in White Plains, New York. Hillary Clinton is beginning to campaign again after taking three days off the trail to recover from pneumonia. Clinton will campaign in North Carolina and Washington D.C. (Photo by Justin Sullivan/Getty Images)

WHITE PLAINS, NY - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton boards her campaign plane at Westchester County Airport on September 15, 2016 in White Plains, New York. Hillary Clinton is beginning to campaign again after taking three days off the trail to recover from pneumonia. Clinton will campaign in North Carolina and Washington D.C. (Photo by Justin Sullivan/Getty Images)