GREENSBORO, NC - SEPTEMBER 15: Democratic presidential nominee former Secretary of State Hillary Clinton leaves a press availability with reporters following 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 speaks to reporters during a press availability following 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: Aides Huma Abedin (L) and Jennifer Palmieri (R) look on as democratic presidential nominee former Secretary of State Hillary Clinton answers questions during a press availability with reporters following 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 speaks to reporters during a press availability following 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 speaks to reporters during a press availability following 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 speaks to reporters during a press availability following 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: Reporters take notes as democratic presidential nominee former Secretary of State Hillary Clinton answers questions during a press availability following 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)