Britain Tennis - Great Britain v Argentina - Davis Cup Semi Final - Emirates Arena, Glasgow, Scotland - 16/9/16 Great Britain's Andy Murray after losing his match against Argentina's Juan Martin del Potro Action Images via Reuters / Andrew Boyers Livepic

Britain Tennis - Great Britain v Argentina - Davis Cup Semi Final - Emirates Arena, Glasgow, Scotland - 16/9/16 Great Britain's Andy Murray in action against Argentina's Juan Martin del Potro Action Images via Reuters / Andrew Boyers Livepic

Britain Tennis - Great Britain v Argentina - Davis Cup Semi Final - Emirates Arena, Glasgow, Scotland - 16/9/16 Great Britain's Andy Murray during his match against Argentina's Juan Martin del Potro Action Images via Reuters / Andrew Boyers Livepic

A monument stands along Kenyatta Avenue in front a branch of Standard Chartered Bank in Nairobi, Kenya, March 3, 2016. REUTERS/Noor Khamis/File Photo

U.S. Vice President Joe Biden addresses the session "Cancer Moonshot: A Call to Action" during the annual meeting of the World Economic Forum (WEF) in Davos, Switzerland in this file photo dated January 19, 2016. REUTERS/Ruben Sprich

A woman, who underwent sterilization surgery at a government mass sterilisation "camp", walks to sit in a hospital bed at a district hospital in Bilaspur, in the eastern Indian state of Chhattisgarh, November 13, 2014. REUTERS/Anindito Mukherjee

An opposition supporter takes part in a rally to demand a referendum to remove Venezuela's President Nicolas Maduro, in Caracas, Venezuela, September 16, 2016. REUTERS/Henry Romero

Lilian Tintori (C), wife of jailed Venezuelan opposition leader Leopoldo Lopez takes part in a rally to demand a referendum to remove Venezuela's President Nicolas Maduro, in Caracas, Venezuela, September 16, 2016. REUTERS/Henry Romero