GREENSBORO, NC - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton speaks during a campaign rally at UNC Greensboro on September 15, 2016 in Greensboro, North Carolina. 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)

GREENSBORO, NC - SEPTEMBER 15: Supporters look on as democratic presidential nominee former Secretary of State Hillary Clinton speaks during a campaign rally at UNC Greensboro on September 15, 2016 in Greensboro, North Carolina. 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)

GREENSBORO, NC - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton waves as she walks off of her campaign plane at Piedmont Triad International Airport on September 15, 2016 in Greensboro, North Carolina. 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)

GREENSBORO, NC - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton waves as she walks off of her campaign plane at Piedmont Triad International Airport on September 15, 2016 in Greensboro, North Carolina. 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)

GREENSBORO, NC - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton (L) greets supporters on the tarmac at Piedmont Triad International Airport on September 15, 2016 in Greensboro, North Carolina. 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)

GREENSBORO, NC - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton (C) walks to her vehicle after landing Piedmont Triad International Airport on September 15, 2016 in Greensboro, North Carolina. 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)

GREENSBORO, NC - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton (L) greets supporters on the tarmac at Piedmont Triad International Airport on September 15, 2016 in Greensboro, North Carolina. 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)

GREENSBORO, NC - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton waves as she walks off of her campaign plane at Piedmont Triad International Airport on September 15, 2016 in Greensboro, North Carolina. 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)