A campaigner attaches American flags to a 'Stop Trump' open-top double decker bus before touring London to urge Americans living abroad to register and vote, Britain September 21, 2016. REUTERS/Stefan Wermuth

A woman sits in a 'Stop Trump' open-top double decker bus before touring London to urge Americans living abroad to register and vote, Britain September 21, 2016. REUTERS/Stefan Wermuth

Campaigners hold placards on a 'Stop Trump' open-top double decker bus before touring London to urge Americans living abroad to register and vote, Britain September 21, 2016. REUTERS/Stefan Wermuth

People walk on a street in Buenos Aires' financial district, Argentina, June 2, 2016. REUTERS/Marcos Brindicci

President Mauricio Macri of Argentina addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 20, 2016. REUTERS/Mike Segar

A Warsaw street signs in Lithuanian and Polish languages are pictured in Vilnius, Lithuania, September 20, 2016. Picture taken September 20, 2016. REUTERS/Andrius Sytas

A woman walks past street signs in Lithuanian and Icelandic languages in Vilnius, Lithuania, September 20, 2016. Picture taken September 20, 2016. REUTERS/Andrius Sytas

A man walks past Tatar street signs in Lithuanian and Tatar languages in Vilnius, Lithuania, September 20, 2016. Picture taken September 20, 2016. REUTERS/Andrius Sytas