Maine Governor Paul LePage speaks at the 23rd Annual Energy Trade & Technology Conference in Boston, Massachusetts, November 13, 2015. REUTERS/Gretchen Ertl/File Photo

Nigerian President Muhammadu Buhari discusses with Facebook founder Mark Zuckerberg during his visit to the presidential villa in Abuja, on September 2, 2016. Nigerian President Muhammadu Buhari on Friday praised Facebook founder Mark Zuckerberg for inspiring young entrepreneurs during his surprise visit to the west African country this week, his office said. Zuckerberg arrived in Nigeria on Tuesday and has met with young entrepreneurs at information technology and computer centres in the country's commercial hub of Lagos and the capital Abuja. / AFP PHOTO / SUNDAY AGHAEZESUNDAY AGHAEZE/AFP/Getty Images

NEW YORK, NY - SEPTEMBER 02: NASA Deputy Director of Science for Communication, Dr. Michelle Thaller helps launch the USPS "Star Trek" Forever Stamps at The Jacob K. Javits Convention Center on September 2, 2016 in New York City. (Photo by Neilson Barnard/Getty Images)

NEW YORK, NY - SEPTEMBER 02: (L-R) NASA Deputy Director of Science for Communication, Dr. Michelle Thaller, actor Walter Koenig who portrayed USS Enterprise Navigation Officer Pavel Checkov on the Iconic television show "Star Trek" and Postmaster General Liz Kaloder help lauch the USPS "Star Trek" Forever Stamps at The Jacob K. Javits Convention Center on September 2, 2016 in New York City. (Photo by Neilson Barnard/Getty Images)

NEW YORK, NY - SEPTEMBER 02: NASA Deputy Director of Science for Communication, Dr. Michelle Thaller (L) and actor Walter Koenig who portrayed USS Enterprise Navigation Officer Pavel Checkov on the Iconic television show "Star Trek" help lauch the USPS "Star Trek" Forever Stamps at The Jacob K. Javits Convention Center on September 2, 2016 in New York City. (Photo by Neilson Barnard/Getty Images)

NEW YORK, NY - SEPTEMBER 02: NASA Deputy Director of Science for Communication, Dr. Michelle Thaller (L) and actor Walter Koenig who portrayed USS Enterprise Navigation Officer Pavel Checkov on the Iconic television show "Star Trek" help lauch the USPS "Star Trek" Forever Stamps at The Jacob K. Javits Convention Center on September 2, 2016 in New York City. (Photo by Neilson Barnard/Getty Images)

Basque separatist leader Arnaldo Otegi (R) smiles beside Doctor of Computer Engineering Iratxe Esnaola and other members of the team that today have publicly submitted their political proposal named "Denon Herria" (A country for all) in the northern Spanish Basque city of San Sebastian on September 2, 2016. / AFP PHOTO / ANDER GILLENEAANDER GILLENEA/AFP/Getty Images

A homeless person sleeps as a disguised man performs next to the coffin with the "body" of Darth Vader, character of the Star Wars cinema movies, promoting the computer games festival opening, in Kiev, on September 2, 2016. / AFP PHOTO / SERGEI SUPINSKYSERGEI SUPINSKY/AFP/Getty Images