Supporters of Venezuela's opposition face police officers who are blocking a street, as they take part in a rally to demand a referendum to remove Venezuela's President Nicolas Maduro, in Caracas, Venezuela, September 16, 2016. REUTERS/Henry Romero

Supporters of Venezuela's opposition (R) face riot police officers who are blocking a street, as they take part in a rally to demand a referendum to remove Venezuela's President Nicolas Maduro, in Caracas, Venezuela, September 16, 2016. REUTERS/Stringer FOR EDITORIAL USE ONLY. NO RESALES. NO ARCHIVES.

Supporters of Venezuela's opposition face police officers who are blocking a street, as they take part in a rally to demand a referendum to remove Venezuela's President Nicolas Maduro, in Caracas, Venezuela, September 16, 2016. REUTERS/Henry Romero

Britain Formula One - F1 - British Grand Prix 2016 - Silverstone, England - 10/7/16 Red Bull Team Principal Christian Horner before the race REUTERS/Matthew Childs Livepic

Nigel Farage (L), the outgoing leader of the United Kingdom Independence Party (UKIP), congratulates new leader Diane James, at the party's annual conference in Bournemouth, Britain, September 16, 2016. REUTERS/Toby Melville

Diane James, the new leader of the United Kingdom Independence Party (UKIP), speaks at the party's annual conference in Bournemouth, Britain, September 16, 2016. REUTERS/Toby Melville

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

Venezuela's new Oil Minister Eulogio Del Pino attends a meeting at Miraflores Palace in Caracas August 20, 2015. REUTERS/Carlos Garcia Rawlins/File Photo