(FILES) This file photo taken on March 31, 2016 shows Bohuslav Sobotka, Prime Minister of the Czech Republic, arriving for a working dinner at the White House in Washington, DC. US Democratic presidential hopeful Hillary Clinton is better than her Republican rival Donald Trump on security for NATO allies, the Czech prime minister said on August 23, 2016, echoing leaders of other alliance members in eastern Europe. / AFP PHOTO / Olivier DoulieryOLIVIER DOULIERY/AFP/Getty Images