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

People wait to buy staple items and basic food outside a supermarket in Caracas, Venezuela September 14, 2016. REUTERS/Henry Romero

Opposition supporters 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

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

A statue of former U.S. President Ronald Reagan is seen after being unveiled outside the U.S. embassy in London July 4, 2011. REUTERS/Suzanne Plunkett

The GM logo is seen at the General Motors Lansing Grand River Assembly Plant in Lansing, Michigan October 26, 2015. Photo taken October 26. REUTERS/Rebecca Cook

The logo of Dow Jones Industrial Average stock market index listed company United Technologies and their subsidiary Pratt & Whitney is pictured in San Diego, California April 21, 2016. REUTERS/Mike Blake

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