Tesla and SpaceX CEO Elon Musk responds to a question by Nevada Republican Gov. Brian Sandoval during the closing plenary session entitled "Introducing the New Chairs Initiative - Ahead" on the third day of the National Governors Association's meeting Saturday, July 15, 2017, in Providence, R.I. (AP Photo/Stephan Savoia)
Tesla and SpaceX CEO Elon Musk responds to a question by Nevada Republican Gov. Brian Sandoval during the closing plenary session entitled "Introducing the New Chairs Initiative - Ahead" on the third day of the National Governors Association's meeting Saturday, July 15, 2017, in Providence, R.I. (AP Photo/Stephan Savoia)
Tesla and SpaceX CEO Elon Musk addresses the closing plenary session entitled "Introducing the New Chairs Initiative - Ahead" on the third day of the National Governors Association's meeting Saturday, July 15, 2017, in Providence, R.I. (AP Photo/Stephan Savoia)
Tesla and SpaceX CEO Elon Musk responds to a question by Nevada Republican Gov. Brian Sandoval during the closing plenary session entitled "Introducing the New Chairs Initiative - Ahead" on the third day of the National Governors Association's meeting Saturday, July 15, 2017, in Providence, R.I. (AP Photo/Stephan Savoia)
Rhode Island Gov. Gina Raimondo chairs a plenary session entitled "The Workforce of Tomorrow" on the third day of the National Governors Association's meeting Saturday, July 15, 2017, in Providence, R.I. (AP Photo/Stephan Savoia)
Oklahoma Republican Gov. Mary Fallin addresses a plenary session entitled "The Workforce of Tomorrow" on the third day of the National Governors Association's meeting Saturday, July 15, 2017, in Providence, R.I. (AP Photo/Stephan Savoia)
Oklahoma Republican Gov. Mary Fallin and South Dakota Republican Gov. Dennis Daugaard, left, laugh as Fallin addresses a plenary session entitled "The Workforce of Tomorrow" on the third day of the National Governors Association's meeting Saturday, July 15, 2017, in Providence, R.I. (AP Photo/Stephan Savoia)
Vice President Mike Pence addresses a National Governors Association session titled "Collaborating to Create Tomorrow's Global Economy" at the second day of the NGA meeting Friday, July 14, 2017, in Providence, R.I. (AP Photo/Stephan Savoia)
Canada's Prime Minister Justin Trudeau, right, speaks with Kentucky Governor Matt Bevin during a special session called "Collaborating to Create Tomorrow's Global Economy" at the second day of the National Governors Association meeting Friday, July 14, 2017, in Providence, R.I. (Ryan Remiorz/The Canadian Press via AP)
Canada's Prime Minister Justin Trudeau, right, speaks with Kentucky Governor Matt Bevin during a special session called "Collaborating to Create Tomorrow's Global Economy" at the second day of the National Governors Association meeting Friday, July 14, 2017, in Providence, R.I. (Ryan Remiorz/The Canadian Press via AP)
Canada's Prime Minister Justin Trudeau, right, meets with Kentucky Governor Matt Bevin during a special session called "Collaborating to Create Tomorrow's Global Economy" at the second day of the National Governors Association meeting Friday, July 14, 2017, in Providence, R.I. (Ryan Remiorz/The Canadian Press via AP)
Canada's Prime Minister Justin Trudeau, right, meets with Kentucky Governor Matt Bevin during a special session called "Collaborating to Create Tomorrow's Global Economy" at the second day of the National Governors Association meeting Friday, July 14, 2017, in Providence, R.I. (Ryan Remiorz/The Canadian Press via AP)
Canada's Prime Minister Justin Trudeau, right, meets with Rhode Island Gov. Gina Raimondo during a special session called "Collaborating to Create Tomorrow's Global Economy" at the second day of the National Governors Association meeting Friday, July 14, 2017, in Providence, R.I. (Ryan Remiorz/The Canadian Press via AP)
Canada's Prime Minister Justin Trudeau, right, meets with Rhode Island Gov. Gina Raimondo during a special session called "Collaborating to Create Tomorrow's Global Economy" at the second day of the National Governors Association meeting Friday, July 14, 2017, in Providence, R.I. (Ryan Remiorz/The Canadian Press via AP)
Canada's Prime Minister Justin Trudeau, right, speaks with Rhode Island Gov. Gina Raimondo during a special session called "Collaborating to Create Tomorrow's Global Economy" at the second day of the National Governors Association meeting Friday, July 14, 2017, in Providence, R.I. (Ryan Remiorz/The Canadian Press via AP)
Canada's Prime Minister Justin Trudeau, right, meets with Rhode Island Gov. Gina Raimondo during a special session called "Collaborating to Create Tomorrow's Global Economy" at the second day of the National Governors Association meeting Friday, July 14, 2017, in Providence, R.I. (Ryan Remiorz/The Canadian Press via AP)
Prime Minister Justin Trudeau, right, meets with Iowa Governor Kim Reynolds during a special session called "Collaborating to Create Tomorrow's Global Economy" at the second day of the National Governors Association meeting Friday, July 14, 2017, in Providence, R.I. (Ryan Remiorz/The Canadian Press via AP)
Virginia Democratic Gov. Terry McAuliffe opens a "Meet the Threat: States Confront the Cyber Challenge" plenary session" at the second day of the National Governors Association meeting Friday, July 14, 2017, in Providence, R.I. (AP Photo/Stephan Savoia)
Canada's Prime Minister Justin Trudeau, right, speaks with Wisconsin Gov. Scott Walker during a special session called "Collaborating to Create Tomorrow's Global Economy" at the second day of the National Governors Association meeting Friday, July 14, 2017, in Providence, R.I. (Ryan Remiorz/The Canadian Press via AP)
Canada's Prime Minister Justin Trudeau, right, meets with Wisconsin Gov. Scott Walker during a special session called "Collaborating to Create Tomorrow's Global Economy" at the second day of the National Governors Association meeting Friday, July 14, 2017, in Providence, R.I. (Ryan Remiorz/The Canadian Press via AP)