JOHNSTOWN, PA - JULY 30: Democratic presidential nominee former Secretary of State Hillary Clinton greets steel workers during a campaign rally with democratic vice presidential nominee U.S. Sen Tim Kaine (D-VA) at Johnstown Wire Technologies on July 30, 2016 in Johnstown, Pennsylvania. Hillary Clinton and Tim Kaine are continuing their a three-day bus tour through Pennsylvania and Ohio. (Photo by Justin Sullivan/Getty Images)

JOHNSTOWN, PA - JULY 30: Democratic presidential nominee former Secretary of State Hillary Clinton greets steel workers during a campaign rally with democratic vice presidential nominee U.S. Sen Tim Kaine (D-VA) at Johnstown Wire Technologies on July 30, 2016 in Johnstown, Pennsylvania. Hillary Clinton and Tim Kaine are continuing their a three-day bus tour through Pennsylvania and Ohio. (Photo by Justin Sullivan/Getty Images)

JOHNSTOWN, PA - JULY 30: Democratic presidential nominee former Secretary of State Hillary Clinton greets steel workers during a campaign rally with democratic vice presidential nominee U.S. Sen Tim Kaine (D-VA) at Johnstown Wire Technologies on July 30, 2016 in Johnstown, Pennsylvania. Hillary Clinton and Tim Kaine are continuing their a three-day bus tour through Pennsylvania and Ohio. (Photo by Justin Sullivan/Getty Images)

U.S. Democratic presidential candidate Hillary Clinton looks at a computer screen during a campaign stop at Atomic Object company in Grand Rapids, Michigan, U.S. March 7, 2016. REUTERS/Carlos Barria/File Photo

U.S. Democratic presidential candidate Hillary Clinton looks at a computer screen during a campaign stop at Atomic Object company in Grand Rapids, Michigan, U.S. March 7, 2016. REUTERS/Carlos Barria/File Photo

The radar technology of a Tesla Model S containing Autopilot features is pointed out during a Tesla event in Palo Alto, California, U.S., October 14, 2015. REUTERS/Beck Diefenbach/File Photo

U.S. Democratic presidential candidate Hillary Clinton looks at a computer screen during a campaign stop at Atomic Object company in Grand Rapids, Michigan, U.S. March 7, 2016. REUTERS/Carlos Barria/File Photo

A new android named "Alter", developed by researchers of Tokyo University and Osaka University jointly, is displayed during a press preview in Tokyo on July 29, 2016. The android, which can move its head, eyes, mouth, body and hands in response to the numbers of people around it, will be displayed from July 30 to August 6 at the National Museum of Emerging Science and Innovation in Tokyo. / AFP PHOTO / TORU YAMANAKATORU YAMANAKA/AFP/Getty Images