A man passes by an advertisement for 'Grey' outside a bookstore in New York, U.S. on June 18, 2015. REUTERS/Brendan McDermid/File Photo

Bobbi Kristina Brown, daughter of the late singer Whitney Houston, waves while arriving with boyfriend Nick Gordon at the premiere of the new film "Sparkle", in Hollywood, California August 16, 2012. REUTERS/Fred Prouser/File Photo

An F-35A Lightning II Joint Strike Fighter takes off on a training sortie at Eglin Air Force Base, Florida in this March 6, 2012 file photo. REUTERS/U.S. Air Force photo/Randy Gon/Handout

The logo of healthcare company Johnson & Johnson is seen in front of an office building in Zug, Switzerland July 20, 2016. REUTERS/Arnd Wiegmann

Green Party presidential candidate Jill Stein speaks at a campaign rally in Chicago, Illinois, U.S. September 8, 2016. REUTERS/Jim Young

Libertarian presidential candidate Gary Johnson is seen during an interview before a rally in New York, U.S., September 10, 2016. REUTERS/Mark Kauzlarich

A man enters the Credit Suisse offices in the Manhattan borough of New York City, U.S. July 5, 2016. REUTERS/Brendan McDermid/File Photo

U.S. President Barack Obama addresses the 39th Annual Congressional Hispanic Caucus Institute Public Policy Conference and Annual Awards Gala, in Washington, U.S., September 15, 2016. REUTERS/Mary F. Calvert