European Council President Donald Tusk (3rdL), European Commission President Jean-Claude Juncker (2ndR) and European Parliament President Martin Schulz (L) pose for a group photo with Slovakia's Prime Minister Robert Fico (C), Slovakia's President Andrej Kiska (3rdR) and Speaker of the Slovakia's National Council Andrej Danko (2ndL) at the Government office ahead of the upcoming European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 15, 2016. REUTERS/Yves Herman

Senator Robert Menendez in Washington July 23, 2015. REUTERS/Gary Cameron/File Photo

Kevin Garratt, a Canadian held in China for two years on suspicion of spying, hugs his wife Julia Garratt after being deported by Chinese authorities, in Vancouver, British Columbia, Canada, in this handout picture taken and released by the Garratt family September 15, 2016. Courtesy of the Garratt Family/Handout via Reuters

Democratic U.S. presidential candidate Hillary Clinton listens to a questionr at a news conference in Greensboro, North Carolina, U.S., September 15, 2016, after she resumed her campaign schedule following a bout with pneumonia. REUTERS/Brian Snyder

Edward Snowden speaks via video link during a news conference in New York City, U.S. September 14, 2016. REUTERS/Brendan McDermid

Edward Snowden speaks via video link during a news conference in New York City, U.S. September 14, 2016. REUTERS/Brendan McDermid

A notice indicating the closure of the shop is placed behind the window of the coffee shop owned by Canadian couple Kevin Garratt and Julia Dawn Garratt in Dandong, Liaoning province, August 5, 2014. REUTERS/Ben Blanchard

Model Gigi Hadid presents a creation from Tommy Hilfiger's Spring/Summer 2017 collection at New York Fashion Week in Manhattan, New York, U.S., September 9, 2016. REUTERS/Andrew Kelly